A cyclist is traveling at 15ms-1 she applies brakes so that she does not collide with a wall 18m away. what deceleration must she have?
Answers
Answered by
4
Answer:
In this question we will calculate the negative acceleration/deceleration, as follows:
Kinematic equations:
SUVAT-- s-displacement, u-initial velocity, v-final velocity,a- acceleration, t-timev=u + atv2 = u2 + 2ass=1/2(u+v)ts=ut + 1/2at2
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
kajal3822:
Thanks
Similar questions
Hindi,
6 months ago
Social Sciences,
6 months ago
Science,
6 months ago
Math,
1 year ago
Physics,
1 year ago
Social Sciences,
1 year ago
Physics,
1 year ago