10. A 300 g ball is struck by a bat with an impact that lasts 0.02 s. If the ball moves through the air towards the bat at 50 m/s and leaves at 100 m/s in the opposite direction, calculate the average force exerted by the bat on the ball 11. A 12000 kg railroad car is coasting along a level, frictionless track at a constant speed of 25 m/s, when a 3000 kg load is dropped vertically onto the car from above. What will its new speed be, assuming the load stays on the car? 12. A 24 g bullet is fired horizontally, embedding itself in a 10 kg block initially at rest on a horizontal surface. The block slides along the ice, coming to rest in 2 s at a distance of 60 cm from its original position. Assuming that the frictional force stopping the block was constant, calculate the velocity of the bullet. 13. A 7 kg bowling ball moving with a velocity of 8 m/s strikes a single pin of mass 1.36 kg. The impact deflects the bowling ball 10 degrees from it's original path. The pin moves along a path 45 degrees from the original path of the ball after the collision. Calculate the velocities of (a) the ball and (b) the pin just after the collision.14. A 48.0 kg skateboarder kicks his 7.0 kg board ahead with a velocity of 2.6 m/s [E]. If he runs with a velocity of 3.2 m/s [E] and jumps onto the skateboard, what is the velocity of the skateboard and skateboarder immediately after he jumps on the board? 15. A basketball of mass 0.23 kg is thrown horizontally against a rigid vertical wall, hitting with a velocity of 20 m/s. It rebounds off the wall travelling at 15 m/s. Determine: (a) the impulse exerted on the basketball by the wall (b) the kinetic energy lost in the collision. 16 A grenade of mass 1.2 kg is at rest on a smooth, frictionless surface when it suddenly explodes into three pieces. A 0.5 kg piece flies off horizontally to the north at 3 m/s, and a 0.3 kg piece flies off horizontally to [S45.W] at 4 m/s. What is the horizontal speed and direction of the third piece