1.State the Work-Energy Theorem.
2.Define conservative and non-conservative forces with examples.
3.State the potential energy formula of a compressed spring.
4.What is coefficient of restitution ($e$) in a collision?
5.A force $F = (3x^2 + 2x) \text{ N}$ acts on a body. Calculate work done in moving it from $x=0$ to $x=2\text{ m}$.
6.A bullet of mass $20 \text{ g}$ moving at $500 \text{ m/s}$ penetrates a sand bag and stops in $10 \text{ cm}$. Find kinetic energy lost and average retarding force.
7.A pump lifts $1000 \text{ kg}$ of water to height $20 \text{ m}$ in $20 \text{ s}$. Find power of pump in kW ($g=10$).
8.A mass $m$ moving with speed $v$ collides head-on elastically with an equal mass at rest. Find final velocities.
