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2. A fireworks rocket is fired vertically upward. At its maximum height of 70.0 m, it explodes and breaks into two pieces, one with mass mA = 1.20 kg and the other with mass mB = 0.20 kg. 1. In the explosion, 800 J of chemical energy is converted to kinetic energy of the two fragments. a) What is the speed of the rocket just before the explosion (when it reaches its maximum height)? How do you know? b) What is the speed of each fragment just after the explosion? (Hint: you will need two conservation laws.) c) It is observed that the two fragments hit the ground at the same time. Assume that the ground is level and air resistance can be ignored. What can you conclude about the directions of the fragments' velocities just after the explosion? Use this to calculate the distance between the points on the ground where they land.

          2. A fireworks rocket is fired vertically upward. At its maximum height of 70.0 m, it explodes and breaks into two pieces, one with mass mA = 1.20 kg and the other with mass mB = 0.20 kg. 1. In the explosion, 800 J of chemical energy is converted to kinetic energy of the two fragments.

a) What is the speed of the rocket just before the explosion (when it reaches its maximum height)? How do you know?

b) What is the speed of each fragment just after the explosion? (Hint: you will need two conservation laws.)

c) It is observed that the two fragments hit the ground at the same time. Assume that the ground is level and air resistance can be ignored. What can you conclude about the directions of the fragments' velocities just after the explosion? Use this to calculate the distance between the points on the ground where they land.

2. A fireworks rocket is fired vertically upward. At its maximum height of 70.0 m, it explodes and breaks into two pieces, one with mass mA = 1.20 kg and the other with mass mB = 0.20 kg. 1. In the explosion, 800 J of chemical energy is converted to kinetic energy of the two fragments.

a) What is the speed of the rocket just before the explosion (when it reaches its maximum height)? How do you know?

b) What is the speed of each fragment just after the explosion? (Hint: you will need two conservation laws.)

c) It is observed that the two fragments hit the ground at the same time. Assume that the ground is level and air resistance can be ignored. What can you conclude about the directions of the fragments' velocities just after the explosion? Use this to calculate the distance between the points on the ground where they land.

Added by Michael S.

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