Question

a certain force exerted for 1.2 second is the speed of an object from 1.8 metre per second to 4.2 metre second later the same force is applied for 2 seconds how much does the speed change into second
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Answer 1

Answer:

the force applied for 1.2 sec changes the velocity from 1.8m/s to 4.2m/s.

So, the acceleration produced by the force

⏩Now again the same force is applied after the body gains a velocity 4.2m/s , so it will produce the same acceleration, that is 2m/s²

In this case, initial velocity (u) = 4.2m/s

acceleration (a) = 2m/s²

and time (t) = 2sec

Using the 1st equation of motion,

v = u + at

v = 4.2 + 2(2)

= 4.2 + 4 = 8.2m/s

Therefore, the velocity changes to 8.2m/s

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