Question

A constant force acts on an object of mass 5 kg for a duration of 2 s. It
increases the object velocity from 3 ms-1 to 7 ms-1. Find the magnitude of the
applied force. Now, if the force was applied for duration of 5 s, what would
be the final velocity of the object?​

Answer 1

Given,

mass=5kg

t

1

=2s

Initial velocity u=3m/s

Final velocity v=7m/s

t

2

=5s

So,

Let the Force be F

Let the acceleration be a

So,

a=

t

(v−u)

=

2

(7−3)

=2m/s

2

So the magnitude of the applied force is 10N

And the final velocity after 5s is v

So,

v=u+at

v=3+2×5

v=13m/s

The final velocity after 5s is 13m/s

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Answer 2

Explanation:

A constant force acts on an object of mass 5 kg for a duration of 2 s. It

increases the object velocity from 3 ms-1 to 7 ms-1. Find the magnitude of the

applied force. Now, if the force was applied for duration of 5 s, what would

be the final velocity of the object?