A TRUCK IS MOVING WITH A VELOCITY OF 72 km/h AND IT TAKES 3s TO STOP AFTER THE BRAKES ARE APPLIED . CALCULATE THE FORCE EXERTED BY BRAKES . MASS OF TRUCK IS 1200 kg.
PLS ANSWER FAST. URGENT
u = 72kmph
= 72 * 5 /18 m/s
=20m/s
v = 0
t = 3
a = v-u / t
= 0-20 / 3
= -20/3 m/s2
We know,
F = ma
= 1200 * 20/3
= 8000N
HEnce Solved......