Question

A cyclist is traveling at 15m/s. She applies brakes so that she dies not collide with a wall 18 m away. What deceleration must she have?

Answer 1

v^2 - u^2 = 2as

0 - 225 = 2 ( 18 ) ( - a )
-225 = - 36 × a

a = 6.25m/s^2

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