20. Applying Knowledge For each pair, determine whether the objects have the same momentum.
If the objects have different momentums,
determine which object has more momentum.
a. a car and train that have the same velocity
b. a moving ball and a still bat
c two identical balls moving at the same speed
in opposite directions

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.