Question

Alice and bob are of equal mass (60kg). Alice has a momentum of 60 kg*m/s. Bob is at rest. Alice runs into bob and stops, while bob starts moving.

Answer 1

Answer:

Bob run with same velocity as Alice is running at first

Answer 2

Given that,

Alice and bob are of equal mass = 60 kg

Momentum of alice before collision = 60 kgm/s

Suppose we need to find the velocity of bob after collision

When alice stoped after collision

We need to calculate the velocity of bob after collision

Using conservation of momentum

$m_{a}u_{a}+m_{b}u_{b}=m_{a}v_{a}+m_{b}v_{b}$

Put the value into the formula

$60+0=60\times0+60\times v$

$v=1\ m/s$

Hence, The velocity of bob after collision is 1 m/s.