A mass of 10 gm moving with a velocity of 100 cm/s strikes a pendulum bob of mass 10 gm. The two masses stick together. The maximum height reached by the system now is g=10m/s2

Initially mass 10 gm  moves with velocity 100 cm/s∴ Initial momentum =10×100=1000gm×msec vsys  then Final momentum =(10+10)×vsys If system rises upto height h then h=vΩy.22g=50×502×1000=2.52=1.25cm