Find the momentum of an 80 kg student that rides a skateboard at the rate of 2 m s . a) 0.25 kgm s b) 16 kgm s eliminate c) 40 kgm s d) 160 kgm s

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.