Question

A cyclist is travelling at 15 m/sec. she applies brakes so that she does not collide with
the wall 18m away. what deceleration must she have?
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Answer 1

Explanation:

HEY MATE ..

ANSWER

Initial velocity, u=15m/s

Final velocity, v=0m/s

Distance, s=18m

Acceleration, a=?

Using relation, v 2 −u 2 =2as.

0 ^2−(15) =2a×18−225=36a

−225 =36a

=−6.25m/s ^2

2 So, deceleration is 6.25m/s ^2