Given:
m(mass of the car)=1200 Kg
u(initial velocity)=25m/s
Time of impact=0.04s
v(final velocity)=0.
Now we know that
v=u +at
Where v is the final velocity
u is the initial velocity
a is the acceleration
t is the time of impact
Substituting these values we get
0=25+ax0.04
-0.04 a =25
a=-625 m/s^2
Now we also know that
F=mxa
Where F is the force
m is the mass of the car
a is the acceleration of the car
F=1200 x 625
F=750000N
