I need help plzzz,help meeee?

Question

I need help plzzz,help meeee?
1)if an arrow is shot upward on the moon with a velocity of 58m/s, its hieght in meters after t seconds is given by
h=58t-0.83t^2
(a)find the velocity of the arrow after 1 s
(b)find the velocity of the arrow when t=a
(c)when wil the arrow hit the moon?
(d)with what velocity will arrow hit the moon?
plz if u know some parts plz do it
thanks a lot

Answer 1

a) sub t=1 in the equation
b) Don't understand
c) solve for h = 0
d) the same as it was when it was shot up.