Given,
Mass of car,
Velocity,
Apply kinematic equation of motion
Breaking force,
Apply first kinematic equation
Breaking force is and time is .
Written on June 21, 2020, 11:01 a.m.
Given,
Mass of car, M=2000kg
Velocity, V=72×185=20ms−1
Apply kinematic equation of motion
v2−u2=2as
0−202=2a×20
a=−10ms−2
Breaking force, F=ma=2000×10=20 kN
Apply first kinematic equation
v=u+at
t=av−u=−100−20=2 sec
Breaking force is 20 kNand time is 2sec.
Written on June 21, 2020, 11:01 a.m.