Question

A boy of mass 40 kg running at 5 ms${}^{-1}$ jumps on a cart of 20 kg moving in the same direction at 2 ms${}^{-1}$. Find their common speed.

• A. 4 ms${}^{-1}$
• B. 10 ms${}^{-1}$
• C. 0 ms${}^{-1}$
• D. 7 ms${}^{-1}$

Answer 1

The correct option is A 4 ms${}^{-1}$