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

no. dot product   =0 when vecs at right angles

volts times amps 6 x 0.5 3w