Question

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

Answer 1

F =m ×a
m=1000kg
initial velocity = 36km/h
$36km \: per \: hour = 36 \times \frac{5}{18} = 10 \: metr \: persecond$

final velocity = 0
time = 5 seconds
$a = \frac{v - u}{t} = \frac{0 - 10}{5} = - 2$
F = ma
$= 1000 \times ( - 2) = \\ = - 2000 \: newton$
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Answer 2

Given,

Initial Velocity= 36km/h=>10m/s

Final Velocity=0 =>(because it comes to rest)

Mass=1000Kg

Time=5 seconds

To find out Acceleration,

v=u+at

Substitute the Values

0=10m/s+(a)(5sec)

0=10m/s+5a

-5a=10

a=10/-5

a=-2m/s sq

Now,Calculate the force

F=ma

=1000kg×(-2m/s)

=1000kg×(-2m/s)F=(-2000N)

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