Question

a body of mass 1000 kg moving at speed of 10m/s reaches the speed of 50m/s in 20s . Calculate the force required to do so.​

Answer 1

Given:-

→Mass of the body=1000kg

→Initial velocity of the body=10m/s

→Final velocity of the body=50m/s

→Time taken=20s

To find:-

→Force

Solution:-

By Newton's 2nd law of motion,we know that:-

=>F=m(v-u)/t

Where:-

•F is force acting.

•m is mass of the body

•v is final velocity of the body

•u is initial velocity of the body

•t is time taken

Now:-

=>F= 1000(50-10)/20

=>F= 1000×40/20

=>F= 1000×2

=>F = 2000N

Thus,the required force is 2000N.

Some Extra Information:-

The theories of Newton's 3 laws of motion are as follows:-

1st law:- "A body at rest will remain at rest and a body in motion will remain in uniform motion,unless an unbalanced force acts on it to change its state of rest or uniform motion."

2nd law: "The rate of change of momentum is directly proportional to the force applied and it will take place in the direction of force."

3rd law: "For every action,there is an equal and opposite reaction."