Question

A car of mass 1000kg moving with velocity 36 km per hour hits a wall and come to rest 5 s
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Answer 1

F = ma

= m(v-u) / t

Since m = 1000kg

u= 36km/h = 36*1000/60*60 = 10m/s

v = 0

t = 5s

=) F = 1000( 0-10) / 5

= 1000*-10/5

= - 2000 N

-ve sign indicates that force is in opposite direction of motion.

Hope it's helpful to u.

Answer 2

Answer:

-2000N

Explanation:

F=ma

F=m(v-u)/t

m=1000kg

v=0m/s

u=36km/h=10m/s

t=5s

then F=1000(0-10)/5=-2000N