Question

A girl of mass 35kg jumps with a horizontal velocity of 10m/s on to a stationary cart with frictionless wheels. Mass of cart is 5 kg what is her velocity as the cart starts moving

Answer 1

hyy!!! ur ans is
m1 = 35kg
m2 = 5kg
u1 = 10m/s
u2 = 0m/s
v =?
m1u1+m2u2 = (m1 +m2)v
35*10 + 5*0 = (35+5)v
350 +0 = 40v
350/40 = v
8.75 m/s = v

hope it will help u...

Answer 2

Answer:

Mass of the girl = 40 kg

Mass of the cart = 3 kg

Velocity of the girl = 5 m/s

Velocity of the cart = 0 m/s

To Find :-

Velocity as the cart starts moving.

Solution :-

Firstly let's find the Mounmentum of girl

[P = mv]

Here,

P = Mounmentum

M = Mass

V = Velocity

P = 40 × 5

Hence, Mounmentum of girl is 200 kg m/s .

Now,

Let's add the Mounmentum of girl and cart

200 + 0 = 200 kg m/s

Let's find total mass

Total mass = 40 + 3 = 43 kg

Velocity=Mounmentum/mass

V = P/M

Velocity = 200/43

Hence :-

Velocity of cart is when start moving is 4.65 m/s.

@ananya