IN a typical Indian Bugghi(a luxury cart drawn by horses), a wooden plate is fixed on the rear on which one person can sit. A bugghi of mass 200 kg is moving at a speed of 10 km/h. As it overtakes a school boy walking at a speed of 4 km/h,. the boy sits on the wooden plate. If the mass of the boy is 25 kg, what will be the new velocity of the bugghi?

Explanation

Mass of the bugghi= 200 kg
`V_B=10 km/hour`
:` Mass of the boy =2.5kg `
`and V_(Boy)=4km/hour`
If we take the boy a bugghi as a system then totla momentum before the process of sitting will remain constant after the process of sitting.
`:m_bV_b+m_(boy)V_(boy)=(m_b+m_(boy)V`
`rarr 200xx1+25x4=(200+25)xxV`
`rarr V=2100/225=28/3=9.3m/sec`