During a football game, a receiver has just caught a pass and is standing still. Before he can move, a tackler, running at a velocity of 4.8 m/s, grabs and holds onto him so that they move off together with a velocity of 2.5 m/s. If the mass of the tackler is 100 kg, determine the mass of the receiver in kilograms. Assume momentum is conserved.

Mass of receiver is 92 kg        

Explanation:

We have given mass of tackler

Let the mass of receiver is

When tackler moving alone velocity is m/sec

And when tackler and receiver is together velocity is = 2.5 m/sec

So from conservation of momentum

So mass of receiver is 92 kg

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this