The velocity of fall of a man jumping with a parachute first increases and then becomes constant. Explain.

Assertion : The velocity of fall of a man jumping with a parachute first increases and then becomes constant. Reason : The constant velocity of fall of man is called terminal velocity.

Under what conditions, the velocity of a body falling in a medium (i) increases with time (ii) becomes constant with time (iii) becomes zero with time.

Air friction increases the velocity of the sastellite. Explain.

Air friction increases the velocity of the sastellite. Explain.

When there are diminishing returns to a factor, total product first increases and then starts falling.

A man standing . Observes rain falling with velocity of 20 m//s at an angle of 30^@ with the vertical find out velocity of man so that rain appears to fall vertically

The intensity of light falling on a phototube is increased while keeping the no of photons falling per seconds constant then for a given experiment.