Question

Question 56:
A girl of mass 50 kg 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 ?

Lakhmir Singh Physics Class 9

Answer 1

Answer:

the answer of your Q. is 0.5 ms^-1.

Answer 2

Answer:

Velocity of the boat backwards = 0.5 m/s.

Explanation:

In the question,

We know that according to the Conservation of the momentum,

It can be stated that,

The product of the mass and the velocity of the object initially is equal to the product of the mass and the velocity of the object finally.

So,

m₁u₁ = m₂u₂

Where,

m₁ is the mass of the girl.

m₂ is the mass of the boat.

u₁ = velocity of the girl.

and,

u₂ = velocity of the boat.

So,

According to the law we can say that,

(50) x (3) = (300) x u₂

So,

u₂ = 0.5 m/s

Therefore, the velocity of the boat backwards = 0.5 m/s.