11. V A particle starts from rest and accelerates as shown in Figure P2.11. Determine (a) the particle's speed at t 10.0 s and at t = 20.0 s, and Answer (b) the distance traveled in the first 20.0 s. Figure P2.11 4. (m/s) (s) 10 15 20 5 -2

An object is thrown straight up with an initial velocity of 31 m/s. a. How high does it go in meters? b. How long is it in the air in seconds?

You throw a ball straight up with an initial velocity of 14.6 m/s. It passes a tree branch on the way up at a height of 5.10 m. a. How much additional time will pass before the ball passes the tree branch on the way back down.? b. How long after the ball is thrown does it pass the branch the first time?

A rectangular painting measures 1.00 m tall and 1.50 m wide, Fig. a. It is hung on the side wall of a spaceship which is moving past the Earth at a speed of 0.90c. (a) What are the dimensions of the picture according to the captain of the spaceship? (b) What are thedimensions as seen by an observer on the Earth? (L=L0*√1 − (?)2 )

A jet plane lands with a speed of 145 m/s and can accelerate at a maximum rate of -7.00 m/?2 as it comes to rest. a. From the instant the plane touches the runway, what is the minimum time interval needed before it can come to rest? b. Can this plane land on a small tropical island airport where the runway is 0.9 km long? Why?

2. V A particle moves according to the equation ¤ = 10t², where is in meters and t is in seconds. (a) Find the average velocity for the time interval from 2.00 s to 3.00 s. (b) Find the average velocity for the time interval from 2.00 to 2.10 s.

С. 13 m/s? D. 4.2m/s? 2. A car has an initial position of 2.7m, an initial velocity of -1.42 m/s, and a constant acceleration of 1.7m/s. What is the position of the car at the time of 1.65s? A. 1.96m В. 6.7m С. 3.8m D. 2.5m 3. Mr. Purley crashed his car with the greatest g force ever survived by a human being. He decelerated from 53.6m/s to zero in a distance of only about .59m calculate Mr. Purley's acceleration. B. 2874m D. 3234m A. 2687m C. 2435m 4. An astronaut drops a rock on an asteroid. The rock is released from a height of 1.45m above the ground 1.89 seconds later. What is the acceleration due to gravity on this asteroid. A. -.17 m/s2 C. -.70 m/s² B. .35 m/s² D. .406 m/s2 MacBook Air

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.

A safety measure when driving cars is to leave a separation of "3 s" with respect to the next car. This rule has made it possible to avoid many accidents. a. If a car travels at 60 km / h, what distance (in meters) will it travel in 3 seconds? Assuming there is an accident 20 m from where you are, what acceleration must you have to bring the car to a complete stop before reaching the accident?b. Repeat part a considering a speed of 90 km / hc. Repeat part a considering a speed of 120 km / hd. Repeat part a considering a speed of 150 km / h

A hyena first notices a lion attacking when the lion is 12.5 m away and moving toward the hyena at a speed of 5 m/s. The hyena begins to accelerate away from the lion at 3m/s and the lion simultaneously begins to accelerate at 2m/s . a. How long in seconds it takes the lion to catch up with the hyena? b. How far in meters has the hyena traveled when the lion catches up with it?