Three objects P, Q and R begin from the same point at and move in a straight line

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Three objects P, Q and R begin from the same point at

t = 0

and move in a straight line. Their velocities vary with time as follows (all in SI units): P:

v = 2t

; Q:

v = 6

(constant); R:

v = 10 - t

for

0 \le t \le 6

. Rank their accelerations at

t = 3\,\text{s}

from highest to lowest.