﻿ A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m s–1 to 3.5 m s–1 in 25 s. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force? from Physics Laws of Motion Class 11 Manipur Board

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A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m s–1 to 3.5 m s–1 in 25 s. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force?

Given,

Mass of the body, m = 3 kg

Initial speed of the body, u = 2 m/s

Final speed of the body, v = 3.5 m/s

Time, t = 25 s

Using the first equation of motion,

v = u + at

Acceleration(a) produced in the body, a =
Therefore,

Now, according to Newton's second law of motion, we have

F = ma

= 3 x 0.06

= 0.018 N

Since the application of force does not change the direction of the body, the net force acting on the body is in the direction of its motion.
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