A 40 gram ball is released from rest and falls vertically onto a steel plate. Th

Question

A 40 gram ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and in contact with is for 0.4 ms. The ball rebounds elastically, and return to its original height. The time interval for a rebound trip is 2.8 s. In this situation, the average force exerted on the ball during contact with the plate is closest to: A car of mass 1500 kg collides head-on with the parked truck of mass 2000 kg. Spring mounted bumpers ensure that the collision is essentially elastic. If the velocity of the truck is 16 km/h (in the same direction as car's initial velocity) after the collision, what is the initial speed of the car Two vehicles approach a right angle intersection and then collide. After the collision, they become entangled. If their mass ratios were 1:3 and their respective speed as they Approached were both 14 m/s, find the magnitude and direction of the final velocity of the wreck. A girls of mass 60 kg throws a ball of mass 0.9 kg against the wall. The ball strikes the wall horizontally with a speed of 23 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.05 s. What is the average force immediately after the collision

Explanation / Answer

1.

the impulse is equal to the change in momentum.

F.dt = m*dv

F = md[v-(-v)]/dt

= 0

force is zero.

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