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Questions  

Starting from rest a 5 kg body gains a velocity of v¯=(3i^+4j^)m/s, in 2.5 S. Then average force acting on the body is

a
5 N
b
3.5 N
c
2.5 N
d
10 N

detailed solution

Correct option is D

a→=v→−0t=3i^+4j^2.5m/s2⇒|a→|=2m/s2 ∴ Average force =ma=5×2N=10N

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