A car C of mass m 1 rests on a plank P of mass m 2 . The plank rests on a smooth floor. The string and pulley are ideal. The car starts and moves towards the pulley with acceleration.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b, c)
Let T = tension in the string.
F = force of friction between C and P.
If the string is under tension, the acceleration of C is the right = acceleration of P to the left = a.
T + F = m 1 a F – T = m 2 a
∴ ∴ T = 
(m 1 – m 2 ) a or T > 0 if m 1 > m 2 .
If m 1 < m 2 , T becomes < 0, i.e., it becomes slack.
If m 1 = m 2 , T = 0
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