Question

A girl of mass 50kg jumps out of a rowing boat of mass

300 kg on to the bank, with a horizontal velocity of 3 m/s.
With what velocity does the boat begin to move backwards?

Answer 1

Given that,

Mass of a girl, m = 50 kg

Mass of the boat, m' = 300 kg

Speed of girl, v = 3 m/s

To find,

The velocity with which the boat begin to move backwards.

Solution,

Let the velocity be v'. Using the conservation of momentum to find it. It is given by :

`mv=m'v'\\\\v'=(mv)/(m')\\\\v'=(50* 3)/(300)\\\\v'=0.5\ m/s`

So, the velocity moves backward with a speed of 0.5 m/s.