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I need help in physics ?

source : yahoo.com

I need help in physics ?

This is a problem about momentum

Momentum = mv= mass * velocity

Olaf’s momentum is 69.6*0 = 0kg/m/s

The Ball’s momentum 0.4kg * 10m/s = 4kg/m/s

When they join, the new weight is 69.6+0.4= 70 kg

Their new momentum is the sum of their momentum before, which is 4kg/m/s still (because momentum is conserved)

Therefore, the new equation is:

p=mv

4=70*v

v is their speed together.

For the next problem, its the same process except Olaf only gains momentum, not weight. The ball will leave Olaf with 9*0.4 = x momentum

This same amount of momentum is transferred to Olaf, so by finding out the ball’s momentum (same as Olaf’s momentum), you can work out Olaf’s speed by the same formula

momentum = mass * velocity

Hope this helps

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