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Evgeni

Velocity – time graph of a moving particle of mass 1 kg is shown in figure: [1M]Is any force acting on the body ? Justify your answer

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Answer:

Step-by-step explanation:Answer

Velocity is nothing but the  slope of x−t graph, so the velocity just before t=4 will be

V  

1

=slope=  

(4−0)sec

(20−0)m

=5m/sec

the velocity just after t=4 will be

V  

2

=slope=  

(8−4)sec

(0−20)m

=−5m/sec

so the change in momentum at t=4sec will be ΔP=m(V  

2

−V  

1

)=1kg(−5−5)m/s=−10Kgm/s  

if considering only magnitude the impulse is 10Kgm/s or 10N−sec

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