A mass of 1kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s Calculate the velocity of other part :

Question

( A ) 100 m/s upward
( B ) 60 m/s downward
( C ) 40 m/s upward
( D ) 40 m/s downward