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Answer:
400 N
Explanation:
m= 1000 kg
u= 72 km/hr. =20 m/s
v=0
s= 500 m
F=?
we have
v²=u²+2as
0=20²+2a*500
1000a =-400
a= -0.4
Now
magnitude of breaking force
F=ma
=1000*0.4
=400 N
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