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

According to the Question we have :-

u = 15m/s (Given)

s = 18m (Given)

v = 0 (As she is applying brakes and coming to stop)

Using the Formula v2- u2= 2as

Putting the values we get:-

(0)2-(15)2= 2xax18

-225= 36xa

∴ a=

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