Physics
posted by Lola PLEASE HELP! .
An 80 quarterback jumps straight up in the air right before throwing a 0.43 football horizontally at 15 . How fast will he be moving backward just after releasing the ball? Suppose that the quarterback takes 0.30 to return to the ground after throwing the ball. How far d will he move horizontally, assuming his speed is constant?

2.4*10^2 m

I think just giving the person an answer is a little unhelpful.
m(VfVi)=m(VfVi)
80(Vf0)=0.43(150)
80(Vf)=0.43(15)
80(Vf)=6.45
Vf=0.80625 m/s
0.080625 m/s * 0.03 m = 0.0241875 m the QB moves horizontally.