Correct Answer  Option 1 : 10 W
CONCEPT:
WorkEnergy Theorem:

The workenergy theorem states that the net work done by the forces on an object is equal to the change in its kinetic energy.
⇒ W = ΔKE
Where W = work done and ΔKE = change in kinetic energy
Power:
 It is defined as the rate of doing work.
\(⇒ P=\frac{W}{t}=Fv\)
Where W = work, t = time, F = force and v = average velocity
CALCULATION:
Given KE_{1} = 50 J, KE2 = 150 J and t = 10 sec
By the workenergy theorem,
⇒ W = ΔKE
⇒ W = KE_{2}  KE_{1}
⇒ W = 150  50
⇒ W = 100 J
So the power of the body is,
\(⇒ P=\frac{W}{t}\)
\(⇒ P=\frac{100}{10}\)
⇒ P = 10 W
 Hence, option 1 is correct.