Question

A ball is thrown vertically upward with velocity 5 m/sec It takes 10 sec for its upward journey The time taken by the ball for its downward journey is

• A. 10 sec
• B. 50 sec
• C. 2 sec
• D. 20 sec

Hint:

For vertical motion under gravity the time taken for upward and downward journeys are equal in the absence of air resistance

Answer 1

The Correct Option is D

The time for the upward and downward journey is the same in the absence of air resistance as gravity acts equally on both the upward and downward journeys Since the time taken for the upward journey is 10 seconds the downward journey will also take 10 seconds Therefore the total time for the entire journey is 10 + 10 = 20 seconds