I'm working on this problem and I've came up with a solution but however I couldn't find anything else to verify the problem so if you could let me know if I did it correctly and help me on the right track what would be super.(adsbygoogle = window.adsbygoogle || []).push({});

The problem goes as folllow: A player is shooting a ball into a net, he shooting with a 45 degree angle and is 4m away from the net and the net is one meter up. How fast must he throw the ball for it to go in (initial speed).

I used the equation: D=v1*t+1/2*a*t^2 and split it into X and Y which gives me these equations:

Y: 1=v1*t+1/2*(-9.8)*t^2 (we allways assume -9.8m/s^2 for gravity)

X: 4=v1*t+1/2* (0) *t^2

and solved it gived me 5.11 m/s but since that the X/Y speed we want the longest line of the triangle so I do

Cos(45)=5.11208/x

x=7.22957m/s

So my answer would be 7.22957m/s

Is this correct or I am way off?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Kinematic Problem verification

**Physics Forums | Science Articles, Homework Help, Discussion**