If the momentum of a body is doubled, its kinetic energy becomes MCQ with Answer and Explanation

Explanation:
Work done (W) is calculated as the dot product of force and displacement: W = F × d × cos(θ). Since the displacement is in the direction of the force, the angle θ is 0°, and cos(0°) = 1. W = 10 N × 2 m × 1 = 20 Joules (J).

Explanation:
R = V²/P = 14400/60 = 240 Ω.

Explanation:
f = 1/P = 1/5 = 0.2 m = 20 cm. Positive power convex lens. Dioptre = 1/m. Standard formula.