Physics (AS & A Level) · Oct / Nov 2017 · Paper 13 · Question 7

Two identical cars P and Q are travelling along a straight road. Car Q is travelling at twice the speed of car P. The brakes are applied to both cars, producing the same constant deceleration. Which graph shows how the velocity v of each car varies with time t?

1. Av-t graph: two straight lines with negative gradient; Q starts higher and reaches zero later than P
2. Bv-t graph: two curves decreasing to zero; Q starts higher than P
3. Cv-t graph: two straight lines with negative gradient; Q starts higher and reaches zero at the same time as P
4. Dv-t graph: two curves decreasing to zero; Q starts higher and reaches zero at the same time as P

As printed in the paper