AIPMT PRELIMS2010Physics-Kinematics
AIPMT PRELIMS 2010 Physics Free Fall MCQ Question
Type: MCQ-numerical-Medium-Class 11
A ball is dropped from a height h at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18 s. What is the value of v? (Take g = 10 m/s²)
A
60 m/s
B
75 m/s
C
55 m/s
D
40 m/s
Correct Answer
Option B
Detailed Explanation
The first ball falls for 18 seconds, covering a distance of 1/2 × g × 18². The second ball falls for 12 seconds, covering a distance of v × 12 + 1/2 × g × 12². Setting these distances equal gives v = 75 m/s.
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