A 50.0-kg boy runs at a speed of 8.5 m/s and jumps onto a cart as shown in the figure. The cart is initially at rest. If the speed of the cart with the boy on it is 2.50 m/s, what is the mass of the cart?

Judy has a mass of 72.0kg and stands on slippery ice. She catches her leaping dog (mass 15.0kg),moving horizontally at 3.00 m/s. What is the speed of Judy and her dog after she catches him?

A 1500 kg car traveling at 12 m/s suddenly runs out of gas while approaching the valley shown in the figure. The alert driver immediately puts the car in neutral so that it will roll.  What will be the car’s speed as it coasts into the gas station on the other side of the valley?

1. In an experiment, you throw a rubber ball of mass m = 25.0 g onto a block of mass M = 250 g that is initially at rest at the edge of a table of height h = 0.98 m. (Figure) The ball bounces back with a speed of 1.01 m/s, and the block eventually lands at d = 1.02 m from the bottom of the table. What is the speed of the ball, right before it hits the block? d

A 50.0-kg boy runs at a speed of 10.0 m/s and jumps onto a cart as shown in the figure.  The cart is initially at rest.  If the speed of the cart with the boy on it is 2.50 m/s, what is the mass of the cart ?

You wake up one morning to find yourself in a strange room with opaque walls, and no visible doors or windows. You decide to do some experiments to find out more about your strange situation. Your own body mass is 59.1 kg. This time you drop a ball from a height of 1.93 m and it hits the floor 0.251 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?      82.4 m/s^2      51.5 m/s^2      71.1 m/s^2      61.3 m/s^2

A 1.2 kg coconut is traveling east at 1.1 m/s when it suddenly explodes into two pieces. A 0.2 kg fragment is shot due north at 1.6 m/s. What is the speed of the second fragment?

Ethan, whose mass is 80 kg, stands at one end of a very long, stationary wheeled cart that has a mass of 500 kg. He then starts sprinting toward the other end of the cart. He soon reaches his top speed of 8.0 m/s, measured relative to the cart. What is the cart’s speed when Ethan reaches top speed?

A golf ball of m=0.05 kg reaches a speed of 95 m/s, 0.01 seconds after it was released. What force did the golf club exert?

Two carts are at rest upon a track and connected by a compressed spring. The spring is released, pushing upon the two carts such that it propels them in opposite directions. One cart has a mass of '2M' and is propelled with a speed of 40 cm/s. The second cart has a mass of '3M' and is propelled with a speed of cm/s. Enter a numerical answer.