PRACTICE / Work by a variable force

An area becomes kinetic energy

A 2 kg cart starts from rest. Along its motion from x = 0 to x = 2 m, the net force is F = 6x N when x is in metres.

Find its final speed.

1. A$2\sqrt3\ \mathrm{m\,s^{-1}}$
2. B$\sqrt{24}\ \mathrm{m\,s^{-1}}$
3. C$12\ \mathrm{m\,s^{-1}}$
4. D$\sqrt6\ \mathrm{m\,s^{-1}}$

Try it on paper first. Free sample problems in every collection include the complete reasoning: find one in this collection →