I hardly call this an elastic collision. With that said, assuming it was elastic, and all of the final KE was dissipated by friction force on the ground...
Initial KE=final work
1/2 *60*g*5.4^2 +1/2*115g*V^2=(115+60)g*.11*.47
divide the g's out, solve for V
Two football players are practicing their tackles. Fred (mass 60 kg) runs to the right at 5.4 m/s. Barney (115 kg) runs towards him straight-on and tackles him. They fall to the ground and slide 47 cm to the left. If the coefficient of kinetic friction between the ground and their uniforms is 0.11, what was Barney’s speed as he ran toward Fred
1 answer
1 answer