Question

A cyclist is travelling at 20 m/s She applies brakes so that she does not collide with a wall 18 m away What deceleration must she have
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Answer 1

Answer:

Initial velocity, u=15m/s

Final velocity, v=0m/s

Distance, s=18m

Acceleration, a=?

Using relation, v2−u2=2as

02−(15)2=2a×18

−225=36a

a=36−225=−6.25m/s2 

So, deceleration is 6.25m/s2.

Explanation:

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