Answer : Speed is 4.2 m/s
Explanation :
The combined mass of the boy and the skateboard is 65 kg
The momentum of the boy and the skateboard is 275 kg m/s
The momentum is given by:
p = m v
where m is the combined mass of boy and the skateboard.
v is the speed of both boy and the skateboard.
[tex]v=\dfrac{p}{m}[/tex]
[tex]v=\dfrac{275\ kg\ m/s}{65\ kg}[/tex]
[tex]v=4.23\ m/s[/tex]
The speed of the boy and the skateboard is 4.2 m/s
So, the correct option is (C).
Hence, this is the required solution.
