Two masses each with mass 0.10 kg are moving with velocity 3 m/s along x axis and 5 m/s along y axis respectively. After an elastic collision, one of the masses moves with a velocity 4^i+4^j. The energy of the other mass after collision is x10 J. Then x is
As we know,
For elastic collision, KEi=KEf
Assume speed after collision is v1 and v2.
Hence, K.E. of second mass after collision is