Question

a car of mass 100 kg moving with a velocity of 36km/hr hits a wall and comes to rest in 5 seconds.find the force exerted by car on the wall.​

Answer 1

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As the given mass= 36kmph

let as convert it into mph

therefore

36×5/18

now u=36kmph

ti=0

t2=5

v=okmph

now let us know the acceleration 

$a = \frac{v - u}{t2 - t1}$

$\frac{0 - 36kmph}{5 - 0}$

$\frac{ - 36 \times 5}{18 \times 5}$

a = -2

f = ma

100 × 2

.°. F = 200N