# Homework Help: Martian Projectile Motion

1. Apr 11, 2010

### Atreyu

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

A Martian creature similar to an Earth frog jumps with an initial
speed v0 and attains the range R over horizontal ground.
The maximum possible height reached by the creature, neglecting
friction in the tenuous Martian air, is ($$\vartheta$$ being the
launch angle):

(a) R/4tan$$\vartheta$$;
(b) R/4sin$$\vartheta$$;
(c) R/2tan$$\vartheta$$;
(d) undetermined because of missing data.

2. Relevant equations

I tried using some formulas to derive the answer...

$$\frac{voy}{g}$$=thighest point

and solved for t,

t=$$\frac{voysin\vartheta}{g}$$

t=$$\frac{R}{vcos\vartheta}$$

and tried using a variety of the range projectile motion equation to get to this answer

3. The attempt at a solution

I know the answer is (a), but is there any easy way to geth there, I feel like I've been going around in circles