AIPMT PRELIMS2003Physics-Motion in a Straight Line
AIPMT PRELIMS 2003 Physics Projectile Motion MCQ Question
Type: MCQ-numerical-Medium-Class 11
A man throws ball with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time ? (Given g = 9.8 m/s²)
A
More than 19.6 m/s
B
At least 9.8 m/s
C
Any speed less than 19.6 m/s
D
Only with speed 19.6 m/s
Correct Answer
Option A
Detailed Explanation
For more than two balls to be in the air simultaneously, the time of flight for one ball must be greater than 2 seconds. Using the formula for time of flight, T = 2u/g, we find that u must be greater than 19.6 m/s.
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