If all of the forces acting on an object balance so that the net force is zero, then
(a) the object must be at rest
(b) the object’s speed will decrease
(c) the object will follow a parabolic trajectory
(d) the object’s direction of motion can change, but its speed cannot
(e) none of the above

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?

What happens when a rubber rod is rubbed with a piece of fur?