Question

A cyclist is travelling at 15m/. She applies
Brakes so that she does not callide with
a wall 18m
away
what acceleration must
she have?​

Answer 1

Answer:

Answer: The correct answer is a= -6.25 meter per second squarea=−6.25meterpersecondsquare .

Explanation:

The expression for the equation of motion is as follows;

v^{2}-u^{2}=2asv

2

−u

2

=2as

Here, v is the final velocity, u is the initial velocity, s is the distance and a is the acceleration.

It is given in the problem that A cyclists is travelling at 15 meter per second she applies brakes so that she does not collide with a wall 18 m away.

Put v= 0, u= 15 m/s and s= 18 m.

(0)^{2}-(15)^{2}=2a(18)(0)

2

−(15)

2

=2a(18)

a= -6.25 meter per second squarea=−6.25meterpersecondsquare

Therefore, the value of deceleration is a= -6.25 meter per second squarea=−6.25meterpersecondsquare .

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Answer 2

Answer:

-6.25 meter per second square

Explanation: