a cyclist is travelling at 15M/s She applies brakes so that she doesn't collide with a wall 18 m away. what acceleration must she have ?
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46
Hi..
Her initial velocity, u is 15m/s
Her final velocity is, v 0m/s (since she stops)
Displacement is, s 18m
Hence the acceleration, a :
v2=u2 + 2as
0=15^2 + 2 x a x 18
0=225 + 36a
36a= -225
a = -225/36
a= -6.25 m/s/s
Therefore she has to decelerate at the rate of 6.25m/s2...
Hope this helps u!!
Her initial velocity, u is 15m/s
Her final velocity is, v 0m/s (since she stops)
Displacement is, s 18m
Hence the acceleration, a :
v2=u2 + 2as
0=15^2 + 2 x a x 18
0=225 + 36a
36a= -225
a = -225/36
a= -6.25 m/s/s
Therefore she has to decelerate at the rate of 6.25m/s2...
Hope this helps u!!
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