Question

A body is projected vertically upward from the card with a velocity 19.6 m/sec. For how long will the body in air?

Answer 1

Time of flight of the body is given as
T = 2u / g
= (2 × 19.6 m/s) / 9.8 m/s²
= 4 seconds

Body will be in air for 4 seconds.