Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 7

The mass of a rocket-propelled truck is approximately equal to the mass of the fuel in its tank. The fuel is ignited and the truck is propelled along horizontal tracks by a constant force. The effect of air resistance is negligible. During a test run the fuel is consumed at a constant rate. Which statement describes the acceleration of the truck during the test run?

1. AThe acceleration of the truck decreases as the fuel is consumed.
2. BThe acceleration of the truck increases as the fuel is consumed.
3. CThe acceleration of the truck remains constant.
4. DThe acceleration of the truck is zero and the truck moves at a constant velocity.

As printed in the paper