Aroller coaster car rapidly picks up speed as it rolls down a slope. as it starts down the slope, its
speed is 5 m/s. then, 4 seconds later, at the bottom of the slope, its speed is 24 m/s. what is its
average acceleration? (show formula, work and units)

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine