Question

A 2 kg blob of sticky putty is thrown with a velocity of 5 m/s at a 1 kg doll. After impact, the putty sticks to the doll and continues flying in the same direction. How fast is the ball or the doll moving after impact

Answer 1

Answer:3.33 m/s

Explanation:

Given

mass of Putty M=2 kg

the velocity of bob u=5 m/s

mass of doll m=1 kg

As there is no external force acting so linear momentum is conserved

Mu=(M+m)v

where v=common velocity of putty and doll after the impact

$2\times 5=(2+1)v\\v=\dfrac{10}{3}\ m/s\approx3.33\ m/s$