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

## Answer this Question

## Related Questions

- Physics - A 79.0-kg fullback running east with a speed of 4.00 m/s is tackled by...
- PHYSICS HELP! - An 88.5 kg fullback moving east with a speed of 5.5 m/s is ...
- physics - 001 (part 1 of 2) 10.0 points An 86 kg fullback moving east with a ...
- Physics URGENT!!! - A 75.0 kg fullback running east with a speed of 6.00 m/s is ...
- physics - A 89.0 kg fullback running east with a speed of 5.00 m/s is tackled by...
- physics - An 87.0 kg fullback moving east with a speed of 5.0 m/s is tackled by ...
- physics - On a very muddy football field, a 110 linebacker tackles an 75 ...
- physic - A 0.500 kg sphere moving with a velocity (2.00 - 3.10 + 1.00) m/s ...
- physics - A 120-kg tackler moving at 5 m/s meets head-on (and tackles) a 80-kg ...
- General Physics - A 0.500 kg sphere moving with a velocity (2.00i - 3.50j + 1....

More Related Questions