An open train car, with a mass of 2130 kg, coasts along a horizontal track at the speed 2.99 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 3.31 s at the rate of 495 kg/s. What is the car's speed vf after the loading is completed? Ignore rolling friction. Uf = m/s

On the set of a new Hollywood movie, a 84.6-kg stunt actor (Max Payne) is tossed straight out of a helicopter hovering (stationary) at a height of 55.3 meters. The stunt actor is thrown from the helicopter at a speed of 4.56 m/s, eventually landing in the water below.  Determine the stunt actor's impact speed and assume negligible air resistance. You can use the approximation that g = 10 m/s2.  Answer: _________ m/s  (round to the nearest hundredth)

During a squash game, a player hits the ball, of 24 g, which is moving toward him horizontally at 150 km/h. The impact between the racket and the ball lasts 1.2 ms and the ball leaves with an identical speed but in the opposite direction as the initial velocity. The ball then hits the wall in front, 8 m away and 18 cm below the height of the hit. What is the average force acting on the ball during the impact?

A 10-m-long glider with a mass of 680 kg (including the passengers) is gliding horizontally through the air at 20 m/s when a 60 kg skydiver drops out by releasing his grip on the glider. What is the glider's speed just after the skydiver lets go?

A tennis ball is flying eastward towards a wall with a speed of 33.7 m/s. After bouncing against the wall, it's flying westward with a speed of 21.9 m/s.  If the mass of the ball is 0.1 kg, and the time the tennis ball is in contact with the wall is 0.032 s, what is the magnitude of the force in N the ball exerts on the wall?

A 6-g bullet is shot into a 2.1-kg block of wood, where it becomes embedded.  The block is initially at rest and the bullet has an initial velocity of 400 m/s.  The block then travels 1.2 m horizontally.  What is the coefficient of kinetic friction between the block and the surface?

A block of mass m1 = 15.5 kg slides along a horizontal surface (with friction, μk = 0.29) a distance d = 2.65 m before striking a second block of mass m2 = 5.25 kg. The first block has an initial velocity of v = 9.25 m/s. What is the speed of m1, in m/s, right before it collides with m2?  Assuming that block one stops after it collides with block two, what is block two's velocity after impact in m/s?

A 14.4-g wad of sticky clay is hurled horizontally at a 71-g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides d=11 m before coming to rest. The coefficient of friction between block and surface is µk=0.56. What is the normal force caused by the ground on the block/blob (again, consider them as one mass)?         2. What is the frictional force on the block/blob?        3. What is the work done by friction on the block/blob?

A 5.0 kg dog stands on an 18 kg canoe at distance D = 6.1 m from the shore.  The dog walks 2.4 m along the canoe toward the shore and then stops.  How far from the shore does the dog end up.

A toy car with a mass of 128 g moves to the right with a speed of 0.810 m/s. A small child drops a 30.0-g piece of clay onto the car. The clay sticks to the car and the car continues to the right. What is the change in speed of the car? Consider the frictional force between the car and the ground to be negligible. -0.15 m/s