A roller coaster climbs up a hill at 4m/s and then zips down the hill at 30 m/s. the momentum of the roller coaster a. is greater up the hill than down the hill
b. is greater down the hill than up the hill
c. remains the same throughout the ride
d. is zero throughout the ride.​

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates