An electric cart is driven by a motor that delivers a constant power. The cart starts from rest and travels along a straight horizontal track. Friction and air resistance are negligible. Which statement describes the variation with time of the kinetic energy of the cart?
It stays constant.
It increases linearly from zero.
It increases non-linearly from zero.
It increases from zero to a maximum and then remains constant.
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.