A delivery robot moves along a straight, level corridor. When the resultant force on the robot is 30 N, its acceleration is 1.2 m s−21.2\ \mathrm{m\,s^{-2}}1.2 ms−2.
A parcel of mass 15 kg is then loaded onto the robot.
What resultant force is needed to give the loaded robot an acceleration of 0.80 m s−20.80\ \mathrm{m\,s^{-2}}0.80 ms−2?
48 N48\ \mathrm{N}48 N
12 N12\ \mathrm{N}12 N
32 N32\ \mathrm{N}32 N
20 N20\ \mathrm{N}20 N