step by step with formula
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Given:
Mass of car = 900 Kg
Iniatial velocity (u) = 72km/hr => 20m/s
final velocity (v) = 0
Time = 3 seconds
(i)V= u+at
0 = 20 + a × 3
a = -20/3 m/s^2
(ii) s= ut +1/2 at^2
s = 20 × 3 - 1/2 × (20/3) × 3^2
s = 30m
(iii) F= ma
F = 900×-20/3
= -6000N
negative sign shows force in opposite direction
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