A truck weighing 1000 kg is moving with velocity of 50 km/h on smooth horizontal roads. A mass of 250 kg is dropped into it. The velocity with which it moves now is

A truck weighing 1000 kg is moving with velocity of 50 km/h on smooth

1.	A truck weighing 1000 kg is moving with velocity of 50 km/h on smooth horizontal roads. A mass of 250 kg is dropped into it. The velocity with which it moves now is
Answer» 12.5 km/h 20 km/h 40 km/h 50 km/h SOLUTION :ACCORDING to LAW of CONSERVATION of linear momentum `m_1 v_1 = (m_1 + m_2) v_2` ` v_2 = (m_1v_1)/(m_1 + m_2) = (1000 xx 50)/(1250) = 40 km//h`