Two masses of 1 kg and 2 kg were dropped from a height of 3.2 metres. Their respective velocities just before touching the ground will be:
(Assume acceleration due to gravity g = 10 m/s2)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 8 m/s for both.
When two objects are dropped from the same height in a vacuum or under negligible air resistance, their final velocities depend only on gravity and height, not on their masses. Using the equation v = 2gh :
v = 2 × 10 × 3.2 = 64 = 8 m/s
Thus, both the 1 kg and 2 kg masses will have a velocity of 8 m/s just before hitting the ground, regardless of their weight difference.