Question

The speed of a cyclist reduced uniformly from 2.5m/s to 1.0m/s in 12s . a) calculate the deceleration of the cyclist
b) calculate the distance covered

Answer 1

Explanation:

given intial velocity u=2.5m/s

finial velocity v=1 m/s

time t=12 s

determine deaacrlartion as shown below

v=u+a*t

a=(v-u) /t

a=1-2.5/12

a=-1.5/12

a=-.125 m/(s) ^2 (ans)...

s=u*t+(1/2)a*(t)^2

=2.5*12+(.5*-.125*((12)^2)

=30-9

=21 m (ans) ...