9. You are pushing a 30-kg wooden crate across the floor. The force of sliding friction
on the crate is 90 N. How much force must
you exert on the crate to keep it moving
with a constant velocity?

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

490 n

f=125n a=2.5m/s2