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Inclined Planes

System is rel...

Question

System is released from rest. Find speed of the blocks after 2 seconds.

A

4.2 m / s

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B

5.6 m / s

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C

2.4 m / s

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D

4.8 m / s

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Solution

The correct option is B $5.6 m / s$
$a = \frac{8 g sin 37^{\circ} - 20}{10} = \frac{80 \times 0.6 - 20}{10} = \frac{28}{10} = 2.8 m s^{- 2}$
$v = u + a t$
$= 0 + 2.8 (2)$
$= 5.6 m / s$

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