Question

A 70.0 kg archer, standing on frictionless ice, shoots a 200 g arrow at a speed of 100 m/s. What is the recoil speed of the archer? A 30 kg beaver is standing on the ice minding his own business. This same arrow travelling at 100 m/s bounces off the beaver, causing the beaverto slide across the ice at 1.2 m/s. What is the rebound velocity ofthe arrow? What percent of kineticenergy was conserved in the collision with the beaver? The archer fires another arrow while he's sliding backwards at 100 m/srelative to his speed. This time, the arrow hits a 2.5 kg bear cub in a perfectly elastic collision. What is the final velocity of the arrow and the bear cub? a. b. c. d.

Answer 1

bulet 10o mls Let the ecoi velac 0. ー0.2x100 beaver す (nav 0. 2

2 0.1x 10000 -o0O x 3ox (1.2) 2 bulot こ 640l+ 21.63 二 661.63 kEiaih ol Va 0.285 tm/s to.st 99-7 m/s

pesufeettd elasti c collision e=1 6 osnital e fes |q.ayニ 0, 2一(-9a.74 Vb) t 2.s.v6 -89.93 rals C in oppos、 dliseatton)