NEET Physics Speed & Velocity MCQ Question
A ball is dropped from a height and loses one tenth of its speed after every collision with the ground. If the initial speed of the ball just before the first collision is 20 m/s, what will be the speed just after the third collision?
14.58 m/s
16.38 m/s
18.24 m/s
19.00 m/s
Correct Answer
Detailed Explanation
After each collision, the ball retains 90% of its speed. Starting with 20 m/s, after the first collision, the speed is 20 * 0.9 = 18 m/s; after the second, it's 18 * 0.9 = 16.2 m/s; and after the third, it's 16.2 * 0.9 = 14.58 m/s.
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