Q1:

A projectile (mass = 0.253 kg) is red at and embeds itself in a target (mass = 1.33 kg). (The target is initially stationary). The target (with the projectile in it) ies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off after being struck? Number I Units 1} A 58.9-kg person, running horizontally with a velocity of +3.02 m/s, jumps onto a 13.6-kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, nd the velocity of the sled and person as they move away. (b) The sled and person coast 30.0 m on level snow before coming to rest. What is the coefficient of kinetic friction between the sled and the snow? (a) Number I Units 4) (b) Number I Units A mine car (mass = 497 kg) rolls at a speed of 0.713 m/s on a horizontal track, as the drawing shows. A 149-kg chunk of coal has a speed of 0.556 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car. Two people are standing on a 3.88-m-long platform, one at each end. The platform oats parallel to the ground on a cushion of air, like a hovercraft. The two people, the platform and a 4.62-kg ball are all initially at rest. One person throws the 4.62-kg ball to the other, who catches it. The ball travels nearly horizontally. Excluding the ball, the total mass of the platform and people is 101 kg. Because of the throw, this 101-kg mass recoils. How far does the platform move before coming to rest again? Number n Units 4}