Question

A ball of mass 3 kg moving with a velocity of $4\frac{m}{s}$ undergoes a perfectly-elastic direct-central impact with a stationary ball of mass m. After the impact is over, the kinetic energy of the 3 kg ball is 6 J. The possible value(s) of m is/are

• A. 1 kg only
• B. 1 kg, 9 kg
• C. 1 kg, 6 kg
• D. 6 kg only

Answer 1

The correct option is B 1 kg, 9 kg

b