A 2000 kg car, along नै- moving direction with velocity of 72 km/hr . made to и is stop by a force of unknown foice-time profile. The car and the collision laste a time-span of at - t does not recoil 0,75.s.
a) find the initial momentum of the car.
b) total impulse felt by the car during the collision.
c) an average force felt by car during the incident.
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Answer:
M=2000kg
Velocity, V=72×
Explanation:
Given,
Mass of car, M=2000kg
Velocity, V=72×
18
5
=20ms
−1
Apply kinematic equation of motion
v
2
−u
2
=2as
0−20
2
=2a×20
a=−10ms
−2
Breaking force, F=ma=2000×10=20 kN
Apply first kinematic equation
v=u+at
t=
a
v−u
=
−10
0−20
=2 sec
Breaking force is 20 kNand time is 2sec.
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