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26-03-2021
Physics

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Please help mee
1. A body weighing 2 kg moves in a straight line with a speed of 72 km / h. If the force 10N will act on the body, after how long will its speed become 30m / s?

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26-03-2021

Answer:

It's an uniformly accelerated motion

Vf=at +v0

v0=72 km/h:3.6=20 m/s

a=F/m=10/2=5m/s^2

t=(vf-v0)/a

t= (30-20)/5=10/5=2s

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