A rigid ball of mass m strikes a rigid wall at 60o and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be

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mV2

mV3

2mV

answer is C.

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Detailed Solution

∆V = Vf-Vi = (-V cos600i⏞-V sin 600j⏞ )-(V cos 600i⏞-V sin 600j⏞)∆V = -2V cos 600i⏞Impulse l = |∆P| = m|∆V| = m(2V cos 600) = mV