Correct Answer - Option 2 : 20 m/s
The correct answer is option 2) i.e. 20 m/s
CONCEPT:
-
Kinetic energy is the energy possessed by a moving object.
- Mathematically, kinetic energy (KE) is expressed as:
\(\Rightarrow KE=\frac{1}{2} mv^2\)
Where m is the mass of the object and v is the velocity of the object.
CALCULATION:
Given - Mass (m) = 100 g = 0.1 kg and Kinetic energy (KE) = 20 J
\(\Rightarrow KE=\frac{1}{2} mv^2\Rightarrow v=\sqrt{\frac{2KE}{m}}\)
\(\Rightarrow v=\sqrt{\frac{2\times 20}{0.1}} = \sqrt{400} =20\, m/s\)
