Question

17) An object of mass 10 kg explodes into three separate pieces. Piece A, of mass 2 kg, moves away from the explosion at 60 m/s. Piece B, of mass 5 kg, moves away at 20 m/s in a direction at 60° to the direction of motion of A. Find the magnitude and direction of the velocity of the third piece, C.
18) Steel balls, each of mass 0.5 g fall from a height of 1 m onto a horizontal surface. The balls hit the surface at the rate of 200 (? not given) per minute. Assuming that the collisions between the balls and the surface are elastic, calculate the average force exerted by the balls on the surface

Answer 1

yes

Answer 2

sorry i'm not good at physics, but maybe the three forces cancel out each other? maybe need to calculate momentum? sorry my physics sucks

Answer 3

yep just find the angle and speed needed to make all momentum vectors add up to 0