9.In which of these situations would the average velocity vector over an interval be equal to the instantaneous velocity vat the end of the interval? () A A body moves along a curved path and speeding up; B A body moves along a straight line at constant speed; C A body moves along a straight line and speeding un.

Assuming the positive direction points North, which of these situations results in a positive velocity and a negative acceleration? A car driving North and speeding up. A plane flying North and slowing down. O A bicycle riding South and speeding up. O An athlete running South and slowing down. O t is impossible to have a positive velocity and a negative acceleration.

A ball is launched from a 10.0 m building with an initial speed of 15.0 ?/?. If the ball’s speed when it reaches its maximum height is 1/3 its speed when it is at half its maximum height, determine ball’s launch angle and the ball’s angle at impact.  This is all the information i was given!

3. Pilots of high-performance aircraft risk loss of consciousness if the undergo accelerations exceeding about 5g. For a military jet flying at 2470 km/hr (about twice the speed of sound), what is the minimum time it takes the jet to reverse its direction in a circular turn while keeping the acceleration below the 5g safety threshold?

42) A man wants to cross a SOD m wide. His rowing speed (relative to river 3000 m/h. The river flows with a of the water ) is the man's ualking peed Aowing & walking) he should take to get the point disctly opposite his star ting point in the shortest time ? b). How long does it take?" speed on shore is 5000 m/h. a). find the path (combined 2000 m/h. If

#2) For this problem, ignore air resistance and assume the magnitude of the acceleration due to gravity is equal to 9.80 m/s². Let's also use up as the positive direction. Report answers to 3 sig figs. ECANSU (A) A rocket, initially at rest on the ground, accelerates straight upward from rest with constant net acceleration of 32.8 m/s2. The acceleration period lasts for a time of 3.47 s until the fuel is exhausted. Find the height the rocket reaches in the first 3.47 s. Show starting equations, algebra first, show final equations, numbers last. (B) After 3.47s, the fuel runs out and the rocket is now in free fall as it continues its motion. Find the total maximum height the rocket reaches as measured from the ground. Show starting equations, algebra first, show final equations, numbers last.

1. During a braking test, a car is brought to rest beginning from an initial speed of 60 mi/h in a distance of 120 ft. With the same constant deceleration, what would be the stopping distance "s" from an initial speed of 80 mi/h? Ans. 213 ft

Given: X - coordinate: x = -5.00sinwt, where w is constant, xis meters, andt is seconds y - coordinate: y = 4.00 - 5.00coswt, where w is constant, y in meters, andt seconds What is the expression for velocity vector? O A. 5w(coswti+sinwi) O B. 5w(-coswtî+sinwî) O C. 5w(coswti-sinwj) O D. 5w(-coswti-sinwî)

what is the answer for the first qustion?

6. The acceleration due to gravity on the surface of the Moon is only 17% of that on the surface of the Earth. If a person can throw a heavy ball 10.0 m vertically upward on Earth, how high could she throw it on the Moon if she gives it the same starting speed? How much longer would it be in motion (up and down) on the Moon compared to on the Earth? A