The drag force on a car increases with speed. At 25 m/s, the total drag force is 500 N. The mass of the car is 1500 kg and the driving force is constant at 950 N.
Which statement about the acceleration of the car at 25 m/s is correct?
The acceleration is 0.30 m/s20.30\text{ m/s}^20.30 m/s2 but will decrease as time passes.
The acceleration is 0.30 m/s20.30\text{ m/s}^20.30 m/s2 but will increase as time passes.
The acceleration is 0.63 m/s20.63\text{ m/s}^20.63 m/s2 but will decrease as time passes.
The acceleration is 0.63 m/s20.63\text{ m/s}^20.63 m/s2 but will increase as time passes.
245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.