(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A particle is projected with a speed of 98 m s−1 at an angle A to the horizontal.

The range of the particle is 940·8 m. Find

(i) the two values of A

3. The attempt at a solution

U = 98cosAi + 98sinAj

i direction

s = ut

940.8 = 98cosAt

j direction

s = ut + (0.5)at[itex]^{2}[/itex]

0= 98sinAt - (0.5)gt[itex]^{2}[/itex]

98sinA = gt/2

t = 20sinA

i direction

940.8 = (20sinA)(98cosA)

94.8 = (2sinAcosA)g

94.8 / g = sin2A

And I end up with a math error. Help please.

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**

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: Projectile on horizontal surface

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