What is the metric si unit used for measuring length?

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?

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?