A glider of mass 0.450 kg0.450\text{ kg}0.450 kg travels along a friction-less track and collides head-on with a stationary buffer of mass 1.35 kg1.35\text{ kg}1.35 kg. Following the collision, the buffer moves forward with a velocity of 2.10 m s−12.10\text{ m s}^{-1}2.10 m s−1 and the glider recoils in the opposite direction with a velocity of 0.80 m s−10.80\text{ m s}^{-1}0.80 m s−1. What was the initial speed of the glider?
5.50 m s−15.50\text{ m s}^{-1}5.50 m s−1
6.30 m s−16.30\text{ m s}^{-1}6.30 m s−1
7.10 m s−17.10\text{ m s}^{-1}7.10 m s−1
15.5 m s−115.5\text{ m s}^{-1}15.5 m s−1
84 exam-style questions on AQA A Level Physics Force, energy and momentum, covering Scalars and vectors, Moments, Motion along a straight line, Projectile motion, Newton's laws of motion, Momentum, Work, energy and power, and Conservation of energy. Each one has a worked solution and a mark scheme showing where the marks go.