Question

A car of mass 1000 kg moving with a speed of 36 km/hr hits a wall and comes to rest in 5 seconds find the force exerted by the car on the wall

Answer 1

HEY MATE !!!!

mass of the car m=1000 kg

initial speed u = 36 km/h

= 10 m/sec

final velocity v= 0

$v = u + \: at \\ 0 = 10 + a \times 5 \\ = \frac{ - 10}{5}$

=-2 m/sec

retardation (negative acceleration)

Force = mass × acceleration

= 1000× -2

=

$- 2000 \: kg \: \frac{m}{ {sec}^{2} }$

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