Question

Certain force acting on a 20000 g mass changes velocity from 5 m/s to 2 m/s. Calculate 2

the work done by the force.​

Answer 1

Question :

Certain force acting on a 20000 g mass changes velocity from 5 m/s to 2 m/s . calculate the work done by the force ?

Answer :

$\sf\pink{Given:}$

• Mass is 20000 g .

• Initial velocity is 5 m/s.

• Final velocity is 2 m/s.

$\sf\pink{To\:find:}$

• Work done by the force ?

Explanation :

Work = force × displacement .

Work = Kinetic energy

Kinetic energy = $\sf{\dfrac{1}{2}m{v}^{2}}$

• v = final velocity .

• m = mass .

• 1 kg = 1000 g

• 20000 g = 20 kg

$\colon\implies\sf{\dfrac{1}{2}\times 20\times 2\times 2}$

$\colon\implies\sf{10\times 2\times 2}$

$\colon\implies\sf{10\times 4}$

$\colon\implies\sf{40 J}$

• Therefore work done is 40 J