Question

A body of mass is 5kg which is moves with velocity 18km/h . calculate its work Done​

Answer 1

$\huge\fcolorbox{red}{cyan}{62.5 Joules}$

Explaination :-

Work Done = Energy Consumed

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

So, Lets Calculate The Energy :-

The Body Is Moving , Therefore it must have Kinetic energy :-

• Mass = 5 kg
• Velocity => 18 km/h = 5 m/s

$\bf\color{purple}{kinetic\:energy=\frac{1}{2}mv²} \\ =>\bf{Lets\:Put\:The\:Values} \\ => \frac{1}{2}\times5\times 5² \\ => \frac{125}{2} \\ =>\boxed{62.5}$

Hope it helped

Answer 2

To Find :-

• It's Work done.

Solution :-

Given,

• Mass of a body (m) = 5 kg
• Initial velocity (u) = 0 km/h ⟶ 0 × 5/18 ⟶ 0 ms-¹
• Final velocity (v) = 18 km/h ⟶ 18 × 5/18 ⟶ 5 ms-¹

According to work - Energy theorem,

⟶ Work done = ΔK.E $\green\bigstar$

[ Put the values ]

⟶ Work done = ¹/2 × m(v² - u²)

⟶ Work done = ¹/2 × 5(5² - 0²)

⟶ Work done = 2.5(25 - 0)

⟶ Work done = 2.5(25)

⟶ Work done = 62.5 Joule $\red\bigstar$

Therefore,

The work done by a body is 62.5 J.