Question

it is required to increase the speed of a scooter weight 80 kg from 5 metre per second 25 m per second in 2 sec what is the force required

Answer 1

F = ma (m-mass, a- acceleration)

So m=80kg, we have to now find out a for getting the force.

So the change in speed(∆v) is 25–5m/s=20m/s and this event took place in 2 sec so a=∆v/∆t

So now we get ∆v/∆t=20/2=10ms²

Therefore m=80kg and a=10ms²

F=80×10=800 Newton(N).

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Answer 2

mass (m) =80kg
initial velocity (u) = 5m/s
final velocity (v) = 25m/s
time(t)= 2s

force(F)= ma
F= m (v-u) /t
F= 80*(25-5)/2
F= 80* 10
F= 800N
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