An object with total mass = 8.9 kg is sitting at rest when it explodes into two pieces. The two pieces, after the explosion, have masses of m and 3m. During the explosion, the pieces are given a total energy of E = 49 J.

1) What is the speed of the smaller piece after the collision?

2) What is the speed of the larger piece after the collision?

3) If the explosion lasted for a time t = 0.02 s, what was the average force on the larger piece?

4) What is the magnitude of the change in momentum of the smaller piece?