JEE Main Physics question
A set of identical cubical blocks lies at rest, parallel to each other, along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is . The block at one end is given a speed towards the next one at time . All collisions are completely elastic. Then,
Answer: (A)
Solution
With equal masses and elastic collisions, each collision simply transfers the full velocity from the moving block to the next one at rest (the first comes to rest, the struck one moves off at ) — like a Newton's cradle. Each block travels distance at speed before striking the next, taking time per
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