Homework Help: Physics

Posted by Kevin on Saturday, February 6, 2010 at 4:45pm.

A 90 kg halfback runs north and is tackled by a 120 kg opponent running south at 4 m/s. The collision is perfectly inelastic. Just after the tackle, both players move at a velocity of 2 m/s north. Calculate the velocity of the 90 kg player just before the tackle.

a.) 3 m/s south
b.) 4 m/s south
c.) 10 m/s north
d.) 12 m/s north

Physics - Priscilla, Saturday, February 6, 2010 at 5:24pm
Given

mA = 90 kg
MAf = 2 m/s

mB = 120 kg
MAi = 4 m/s
MAf = 2 m/s

Use the equation:::

(MA)(VAf) + (MB) (VBf) = (MA)(VAi) + (MB)(MBi)

If you have any questions, just reply back.
Physics - Damon, Saturday, February 6, 2010 at 5:25pm
north momentums:

before
90 v - 120 * 4

after
(90+120) * 2

set those equal and solve for v

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