Aforce of 450 n accelerates a box across a frictionless surface at a rate of 15 m/s2. find the mass of the box?

a) 30 n

b) 30 kg

c) 6,750 n

d) 6,750 kg

As the distance from a magnet increases, what happens to the magnet force?

Aball is rolled uphill a distance of 5 m before it slows, stops, and begins to roll back. the ball rolls downhill 9 m before coming to rest against a tree. what is the magnitude of the balls displacement? a. 4 meters b. 9 meters c. 14 meters d. 45 meters

Two point charges lie on the x axis. a charge of + 2.30 pc is at the origin, and a charge of − 4.50 pc is at x=−11.0cm. what third charge should be placed at x=+26cm so that the total electric field at x=+13.0cm is zero? express your answer to three significant figures and include appropriate units.