32. mmh Two rockets are flying in the same direction and are side by side at the instant their retrorockets fire. Rocket A has an initial velocity of +5800 m/s, while rocket B has an initial velocity of +8600 m/s. After a time t both rockets are again side by side, the displacement of each being zero. The acceleration of rocket A is – 15 m/s². What is the acceleration of rocket B?

7. The height of a helicopter above the ground is given by h =20.0 t-5.0 t where h is in meters and t is in seconds. At t=1.00 s, the helicopter releases a small mailbag. a) What is speed of a mailbox before hint to the ground? b) How long mailbox in air? 8. Starting from rest at 5 m from origin, a small still ball's horizontal component of velocity is 90.0 mile/hour in a straight line in 10.0 s. Ball's acceleration is constant during the entire motion, what is ball's final position?

4. You wake up in a strange room, with opaque walls, and no visible doors or windows. you drop a ball from a height of 1.12 m and it hits the floor 0.191 s after you drop it. This time you suspect you are on a rocket that has just left the surface of the Earth, and is still not too far above the ground. What do you deduce the rocket s acceleration to be?     71.2 m/s^2     61.4 m/s^2     98.0 m/s^2     51.6 m/s^2

Ball bearing manufacturing is quite an art! In order to make perfect spherical balls, the manufacturers let molten metal droplets to fall inside a tall tower (i.e. the shot tower) to solidify as they fall. If a ball bearing needs 2.75 seconds to solidify enough for impact, how tall (in m) must the tower be? Use 9.80 m/s2 for the local acceleration due to gravity and assume no significant air resistance.

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An object is thrown straight up in the air with initial speed 20. 0 m/s.What are the velocity and acceleration of the object at its maximum height? Positive y points upward. Ov = 0 m/s, a = 9.81 m/s? Ov%3D -20.0 т/s, a — — 9.81 m/s* v = 20. 0 m/s, a = - 9. 81 m/s? Ov = 0 m/s, a = -9. 81 m/s² Ov= Оv%3D 20.0 m/s, a — 9. 81 m/s? Ov = -20.0 m/s, a = 9. 81 m/s²

7. Sergio kicks his soccer ball horizontally off the roof. The roof is 2.7 m high and the ball leaves the roof at 4.3 m/s. How long is the ball in the air? 8. From the previous problem, how far from the base of the roof does the ball land?

A rhinoceros is at the origin of coordinates at time t1 = 0. For the time interval from t1 to t2 = 11.0 s, the rhino's average velocity has x-component - 4.20 m/s and y-component 5.10 m/s.  a. At time t2 = 11.0 s what is the x-coordinate of the rhino? b. At time t2 = 11.0 s what is the y-coordinate of the rhino? c. How far is the rhino from the origin?