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The diagram shows particles A and B, of masses 0.2kg and mkg respectively, connected by a light inextensible string which passes over a fixed smooth peg. The system is released from rest, with B at a height of 0.25m above the floor. B descends, hitting the floor 0.5s later. All resistance to motion may be ignored. (a) Find the acceleration of B as it descends. (b) Find the tension in the string while B is descending and find also the value of m. (c) When B hits the floor it comes to rest immediately, and the string becomes slack. Find the length of time for which B remains at rest on the ground before being jerked into motion again. |
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Answer» (a) 2 ms-2 , (b) 2.4 N, 0.3 (c) 0.2 s |
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