A 1210 kg rollercoaster car is moving 8.37 m/s. Before entering
the station, it first rolls up a 2.26 m
hill. How fast is it moving then?
(Unit = m/s)

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

What does si stand for,when referring to a system of measurement

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?