1. A gun is mounted on a cart. Initially the cart is not moving. After the bulle

Question

1. A gun is mounted on a cart. Initially the cart is not moving. After the bullet is fired, what is the velocity of the cart? The bullet hits the plate, and fuses with it. What then?

2. Is Kinetic Energy conserved in an elastic collision?

3. Is kinetic ENergy conserved by a particle in a gravitational field?

4. Is Kinetic Energy conserved in an inelastic collision?

5. What is conserved in the last two cases?

6. To labor it, is Kinetic Energy cosnerved in all interactions?

7. WHat hen givesd you the right to claim conservation of energy as a principle?

8. a sack of cement drops from a great height. Just before impact its velocity is high. After impact it is zero. Discuss all aspects of energy in this process.

9. Is energy always Fdx?

Please explain and show work.

Explanation / Answer

from conservation of momentum
intial momentum = final momentum
0 = mV1 +MV2
velocity of the cart V2 = -mV1/M
m = mass of the bullet
M = mass of the cart
2.
yes KE is conserved in elastic collision
3.
yes
4.
KE is not conserved in inelastic collision
5.
momentum is conserved
6.
No
7.
conservation of energy holds good when only spring force and gravitational force and central forces do work on the sysytem
8.
momentum is conserved
9.
no energy is fdx only when constant force acts on it

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