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CGP EDU Academic Team
Published on: September 12, 2026
A mass of 20 kg moving with a speed of 10m/s collides with another stationary mass of 5kg. As a result of the collision, the two masses stick together. The kinetic energy of the composite mass will be
Text Solution
Verified by ExpertsThe correct answer is:
B
$m_1 v_1 + m_2 v_2 = (m_1 + m_2) v_{\text{sys.}}$
$20 \times 10 + 5 \times 0 = (20 + 5) v_{\text{sys.}}$ ⇒ ⇒ $v_{\text{sys.}} = 8\,m/s$
K.E. of composite mass $= \frac{1}{2} (20 + 5) \times (8)^2 = 800 J$
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