A probe weighs 48 N where g=4.0 N kg−1g=4.0\ \mathrm{N\,kg^{-1}}g=4.0 Nkg−1. A resultant horizontal force of 18 N acts on it. What is its horizontal acceleration?
0.375 m s−20.375\ \mathrm{m\,s^{-2}}0.375 ms−2
6.0 m s−26.0\ \mathrm{m\,s^{-2}}6.0 ms−2
4.5 m s−24.5\ \mathrm{m\,s^{-2}}4.5 ms−2
1.5 m s−21.5\ \mathrm{m\,s^{-2}}1.5 ms−2