Before jumping in water from above a swimmer bends his body to

Q: Before jumping in water from above a swimmer bends his body to

(a) Increase moment of inertia

(b) Decrease moment of inertia

(c) Decrease the angular momentum

(d) Reduce the angular velocity

Ans: (b)

Sol: As we have seen that before jumping in water from above a swimmer bends his body because by doing this his moment of Inertia decreases and hence angular velocity increases (L = I ω = constant ) . But on reaching the surface of water he stretches the body so that moment of inertia will increase and hence angular velocity will decrease . Hence he keeps his body safe by doing this .