Question

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

Answer 1

u = 15 ms^-1

v = 0

s = 18 m

a = ?

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Here, we will use the formula

v²-u² = 2as

Hence, we get

0² - 15² = 2×18×a

-225 = 36×a

a = -6.25 ms^-2

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