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Question

Physics Question on laws of motion

A block of mass 7 kg is placed on a smooth table. An unstretchable thread tied to it passes over a frictionless pulley and carries another mass of 3 kg at other end. The acceleration of the system is

A

100 ms−2100\,ms^{-2}

B

3 ms−23\,ms^{-2}

C

10 ms−210\,ms^{-2}

D

30 ms−230\,ms^{-2}

Answer

3 ms−23\,ms^{-2}

Explanation

Solution

Here, Acceleration, a=m2(m1+m2)g=3×10(7+3)=3 ms−2a = \frac{m_2}{(m_1 + m_2)} g = \frac{3 \times 10}{(7 + 3)} = 3 \, ms^{-2}