A powered camera dolly is tested twice while carrying the same equipment, so its mass is constant. The size of its measured acceleration increases from 1.0 m s−21.0\ \mathrm{m\,s^{-2}}1.0 ms−2 to 2.5 m s−22.5\ \mathrm{m\,s^{-2}}2.5 ms−2.
How does the size of the resultant force on the dolly change?
It increases to 2.5 times its original value.
It increases to 1.5 times its original value.
It cannot be determined unless its mass is measured.
It increases by a force of 2.5 N2.5\ \mathrm{N}2.5 N.