Question

In which of the following cases the net force acting on the body is not zero?
(A) A drop of rain falling down with a constant speed
(B) A cork of mass 10 g floating on the surface of water
(C) A car moving with a constant speed of 20 km h on a rough road
(D) A pebble of mass 0.05 kg is thrown vertically upwards​

Answer 1

Answer:

(D) A pebble of mass 0.05 kg is thrown vertically upwards

Explanation:

The rain drop is falling with a constant speed. Hence, it acceleration is zero. As per Newton's second law of motion, the net force acting on the rain drop is zero

Answer 2

Answer:

(D) A pebble of mass 0.05kg is thrown vertically upeards