Lessons

Eamcet Physics
1 st Year : Unit 3.5( Laws of Motion ) - Block on Block

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Q.

A 4 kg block A is placed at the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 20 N is applied on A. The maximum horizontal force F required to make both A & B move together is

View Answer

Correct choice: D

Explanation:

20 = 4a
a = 5 ms-2
F = (m1 + m2) a
F = (4 + 8) 5
F = 60 N
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