True or false transverse and congressional waves are the two types of mechanical waves

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Match each scenario to the form of energy it represents

What is the single most important equation in all of physics?