Question

A cyclist is travelling at 15m s-1. She applies brakes so that she does not collide with a wall 18m away. What acceleration must she have.​

Answer 1

Answer:

${v}^{2} = {u}^{2} + 2as \\ 0 = {15}^{2} + 2( - a)18 \\ a = 6.25m {s}^{ - 2}$