Posted by **EM** on Friday, February 18, 2011 at 8:56am.

1....How much force needed to bring a 3200 lb car from rest to a velocity of 44 m/s in 8 sec.?

2....A ball with a mass of 2 kg move to the right with a speed of 2 m/s. It hits a ball of mass 0.50 kg which is at rest. After collision the second ball moves to the right with a speed of 1 m/s. What happens to the first ball?...Suppose that the 2 balls stick together moves as one after collision, what is their final velocity?

- PHYSICS -
**bobpursley**, Friday, February 18, 2011 at 9:02am
1. Force*time=changemomentum

2. Momentum is conserved.

- PHYSICS -
**drwls**, Friday, February 18, 2011 at 9:03am
1. Impulse = force x time

= momentum change

Apply the formula

2. Total momentum remains the same.

In the second case,

M1* (2 m/s) = (M1 + M2)*Vfinal

Vfinal = (2/2.5)* 2 m/s = __

Try doing the first case yourself. Make sure + is right and - is left for velocity.

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