# physics.

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1) A racing car has a mass of 1525 kg. What is its kinetic energy if it has a speed of 35 m/s?

* 2-3 Conservation of Momentum

2) A 3.0 kg ball is moving at 3 m/s and strikes a 1.5 kg ball moving at -2 m/s. After the collision, the 1.5 kg ball moves to the right at 2 m/s. What is the final velocity at 3.0 kg ball?
FORMULA(2)>> m1vi+m2vi= m1vf+m2vf

3) A 85 kg running back is moving at +12 m/s and strikes a 125 kg linebacker moving at -8.0 m/s. What is the final velocity if they stick together?
FORMULA(3)>> m1vi+m2vi= (m1+m2)vf

• physics. -

1. KE=1/2 mass*velocity^2

2, 3: what is your question? you are given the data, and the formula.

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