New to the forums, just starting a physics 11 course online and having some troubles with formulas.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

Projectile shot straight upwards, flight time = 4.70 sec

Second Launch at 45 degrees (horizontal range approx. 50-60 meters

A) Find Launch Velocity

B) Find Horizontal Range when shot at 45 degrees

2. Relevant equations

d = vit +1/2gt2

V = - 1/2gt ("made" this one myself from above formula, unsure if correct)

3. The attempt at a solution

Launch velocity

V = - 1/2gt

g = -9.8m/s

t = 4.7s

V = -[((1/2(-9.8))(4.7)]

V = -((-4.9)(4.7))

V = 23.0 m/s

I have no idea how to calculate the horizontal range, I need a formula that incorperates the 45 degrees

Thanks in advance!

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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

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: Projectiles: Launch speed and horizontal distance

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