Question

If a moving body of mass 100g has kinetic energy 45 joules, what will be it's velocity?​

Answer 1

`\boxed{\pink{\sf Velocity \ of \ the \ body \ is \ 30m/s .}}`

Step-by-step explanation:

Given that a body is moving which has a mass of 100g. And its Kinetic energy is 45 Joules . We need to find its velocity . So ,

`\boxed{\red{\bf Kinetic\: Energy =(1)/(2)mv^2 }}`

Now here mass is in grams. So converting it into SI units we have , 100/1000 kg = 0.1 kg

`\implies KE =(1)/(2)mv^2 \\\\\implies 45 J = (1)/(2)* (1)/(10) kg * v^2 \\\\\implies v^2 = 45 * 20 \\\\\implies v^2 = 900 m^2/s^2 \\\\\implies v =√(900 m^2/s^2) \\\\\underline{\boxed{\blue{\tt \implies Velocity = 30m/s }}}`