Question

A bag of sand of mass 2 kg is suspended by a rope. A bullet of mass 10g is fired at it and gets embedded into it. The bag rises up a vertical height of 10 cm. The initial velocity of the bullet is nearly –

• A. 70 m/s
• B. 140 m/s
• C. 210 m/s
• D. 280 m/s

Answer 1

Answer: (D)

280 m/s

Answer 2

(.01)V + 0 = (2.01)V₁

Now 10 C.M. = $\frac{V_{1}^{2}}{2g}$