Question

A body of mass 1 kg is suspended by a weightless string which passes over a frictionless pulley of mass 2 kg as shown in the figure. The mass is released from a height of 1.6m from the ground. With what velocity does it strike the ground?

• A. 16 m/s
• B. 8 m/s
• C. \( 4\sqrt{5} \) m/s
• D. 4 m/s

Answer 1

The Correct Option is B

By applying the principle of conservation of mechanical energy, the potential energy of the body is completely converted into kinetic energy during the fall.
Using the equation \(mgh = \frac{1}{2} mv^2 ,\) we solve for \( v \), which gives \( v = 8 \, \text{m/s} \).