Question : A body of mass 4 kg accelerates from 15 m/s to 25 m/s in 5 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).
Option 1: 32
Option 2: 8
Option 3: 16
Option 4: 64
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Correct Answer: 8
Solution : The correct answer is 8.
Force = Mass(m)* Acceleration(a)
Acceleration of the body is to be calculated first:
Acceleration(a)= Change in Velocities (v-u)/Time Taken(t),
where v=Final velocity and u =Initial Velocity
a = (v-u) / t
a = (25-15) / 5
a = 2 m/s²
Now, the force applied to the body is:
F=m*a
F = (4)(2)
F = 8 N
As a result, the force's magnitude is 8 N .
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