A heavy rock is thrown straight up with a velocity of 160 ft/ sec. The of S= 160t - 16t2 ft after t sec. Find: i. How high does the rock go? ii. What are the velocity of the rock when it is 256 ft above the ground on the way up? iii. What is the acceleration of the rock at any time t?

3. A jet plane has a takeoff speed of Vtakeoff = 60 m/s and can move along the runway at an average acceleration of 2.0 m/s². The runway is 1.5 km. a. Write out the 3 Kinetic equations. 2. v2-U2= Jas 3.5=uttata2 b. Write out the values of initial position, initial velocity, and acceleration. initial position uloity- a: 0.2m/s init.al aueleradion- How many seconds will it take for the plane to reach takeoff speed? С. d. How far will the plane have to travel to get to takeoff speed? e. will the plane be able to get to 60 m/s before it gets to the end of the runway?

7. A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the moon is 1.67 m/s?. Determine the time for the feather to fall to the surface of the moon. a. 2.29 s b. 1.29 s. c. 1.29 m d. 0.29 s. a C d

I see that an object has is decelerating, what does this tell me about A? A. Nothing at all, what i see has nothing to do with A B. A is a positive C. A is a negative  D. A could be either, depending on the direction of the velocity Can I do the vertical part of a projectile motion problem separately from the horizontal part? A. Always.  Horizontal motion is completely separate from vertical motion though they share time B. Never.  C. Only under very special circumstances

A car traveling at 20m/s is attempting to drive up an icy hill. When it getsonto the hill, it is able to go 10 meters before it hits some ice and begins sliding. Assume the hillis a 10 degree incline.   A. How far up the hill does the car travel before it starts to slide back down? Make sure toinclude the initial 10 meters in your final distance.   B. If the car then slides all the way back to the bottom of the hill, what is its speed when itgets to the bottom? Assume it doesn’t gain traction back, so it is sliding with no frictionthe whole way down.

A ball is thrown straight up. What is the velocity and  acceleration of the ball at the higest point (peak)?   A. velocity = 0m/s and acceration = 9.8 m/s2 down.   B. velocity = 0 m/s  amd acceleration = 0 m/s2   C. velocity = 0 m/s and acceleration = 9.8 m/s2 up   D. velocity = 9.8 m/s up and acceleration = 0 m/s2

More people end up in U.S. emergency rooms because of fall-related injuries than from any other cause. At what speed v would someone hit the ground who accidentally steps off the top rung of a 4.0 m tall stepladder?   a. 8.9 m/s   b. 7.1 m/s   c. 6.2 m/s   d. 8.0 m/s   e. 9.8 m/s A spring gun launches a heavy steel marble with an initial speed of 19.6 m/s. How long will the steel marble be in the air?     a. 6.0 s   b. 2.0 s   c. 3.0 s   d. 5.0 s   e. 4.0 s A car is traveling in a straight line along a straight, level road at 15.0 m/s when it uniformly accelerates at 3.00 m/s2 for a time of 6.00 s. How far does the car travel in this time?     a. 90 m   b. 54 m   c. 126 m   d. 162 m   e. 144 m

Weddell seals make holes in sea ice so that they can swim down to forage on the ocean floor below. Measurements for one seal showed that it dived straight down from such an opening, reaching a depth of 0.30 km in a time of 5.0 min. What was the speed of the diving seal?A. 0.60 m/s B. 1.0 m/s C. 1.6 m/s D. 6.0 m/s E. 10 m/s

2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.

3. A quarterback throws a football with initial velocity components Voy= 10.0 m/s (upward) and Vax = 19.0 m/s (down the field). It is caught at the same height it is thrown from. a. How long does it take for the football to reach its maximum height? b. How high is this point above where the ball was released? c. How much time, after it was thrown, elapses before the ball is caught? Compare this time to what you found in part (a). d. How far away from the quarterback is the ball when it is caught? 4. Repeat question 3, but have the initial speed of the ball be 28.0 m/s and the initial angle be 38.0° up from horizontal.