Answer :
Momentum = (mass) x (speed)
10 kg-m/sec = (mass) x (1.5 m/s)
Divide each side by 1.5 m/s :
Mass = 10 kg-m/sec / 1.5 m/s = (6 and 2/3) kg
10 kg-m/sec = (mass) x (1.5 m/s)
Divide each side by 1.5 m/s :
Mass = 10 kg-m/sec / 1.5 m/s = (6 and 2/3) kg