In a football game, a tackle running at a constant speed of 7 m/s tackles a stat

Question

In a football game, a tackle running at a constant speed of 7 m/s tackles a stationary receiver. The two fly off horizontally at 3 m/s, before they hit the ground and begin to slow down. If the mass of the tackle is 150 kg,

a.) What is the mass of the receiver?


b.) Calculate the kinetic energy of the tackle-receiver system before and after the collision.
KEsys, i = ___J
KEsys, f = ___J
(Did the mechanical energy of the system increase, decrease, or stay the same?)

c.) What kind of collision is this?

Explanation / Answer

a) Since this is conservation of momentum.
(mv)intial=(mv)final, Therefore account only for the tackler 150*7=(M-150)3. Where M will Be the mass of the receiver. Doing the algebra you should get, M=200 kg.

2) KE= 1/2mv2 Initially its 1/2 (150) 72= KEintital and   1/2 (350) 32 = kinetic energy final.

3) This type of collision is ineleastic.

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