A50-cm-long spring is suspended from the ceiling. a 290 g mass is connected to the end and held at rest with the spring unstretched. the mass is released and falls, stretching the spring by 30 cm before coming to rest at its lowest point. it then continues to oscillate vertically.
(a) what is the spring constant? (k=)
(b) what is the amplitude of the oscillation?
(c) what is the frequency of the oscillation?

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers total displacement?

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.

What is an electric motor? explain its operation. 2-3 sentence