Question

What force can change the velocity of a body of mass
1 kg from 20 m/s to 30 m/s in 2 seconds?
10N
15 N
5 N
25 N​

Answer 1

Given:-

• Mass of the body = 1 kg

• Final velocity = 30 m/s

• Initial velocity = 20 m/s

• Time take by body = 2 s

To Find :-

• What force can change the velocity of mass 1 kg from 20 m/ s to 30 m/s in 2 seconds = ?

Solution:-

• To calculate the force required when the final velocity to intial velocity from 30 m/s to 20 m/s in 2 seconds , at first we have to decrease final velocity from intial velocity then dividing by 2.

Calculation :-

==> Forced required = Final velocity - Intial velocity / 2

==> Forced required = (30 - 20) / 2

==> Forced required = 10 / 2

==> Forced required = 5 N

Hence,

• The required Forced = 5 N

Answer 2

Answer:

Given :-

• The velocity of a body of mass is 1 kg from 20 m/s to 30 m/s in 2 seconds.

To Find :-

• What is the force that can change the velocity of a body.

Formula Used :-

$\clubsuit$ Newton's Second Law :

$\longmapsto \sf\boxed{\bold{\pink{Force =\: \dfrac{v - u}{t}}}}$

where,

• v = Final Velocity
• u = Initial Velocity
• t = Time

Solution :-

Given :

• Initial Velocity (u) = 20 m/s
• Final Velocity (v) = 30 m/s
• Time = 2 seconds

According to the question by using the formula we get,

$\implies \sf Force =\: \dfrac{30 - 20}{2}$

$\implies \sf Force =\: \dfrac{10}{2}$

$\implies \sf Force =\: \dfrac{\cancel{10}}{\cancel{2}}$

$\implies \sf Force =\: \dfrac{5}{1}$

$\implies \sf\bold{\red{Force =\: 5\: Newton}}$

$\therefore$ The force that can change the velocity of a body is 5 Newton .

Hence, the correct options is option no c) 5 N .