Question 106468
the general equation is h=(-gt^2)/2+(v0)t+h0; where h=height, g=gravitational acceleration, v0=initial velocity, h0=initial height, and t=time of flight


for 5), solve the general equation for t when h=0 (on the ground)
...then use v=-gt+v0 to find the impact velocity


for 7), you know all the values except for h0 in the general equation, so just plug in