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

A snowball rolls off of a roof angled downwards at 40.0 degrees, it has an initial velocity of 7.00 m/s. The roof is 14.0m tall.

Find how far from the edge of the roof the snowball falls

2. Relevant equations

I know that cos -40 x 7.00m/s is the horizontal velocity, and Vy initial is sin -40 x 7.00.

3. The attempt at a solution

OK, this seemed like a ridiculously easy problem, but the thing is I keep getting a value of t that i just know isnt correct (my friend already solved it, but I'd rather understand what I'm doing wrong than just copy).

To find t (time), I used Y= Yo + Vy x t + 1/2gt^2

I put in the values and had the ground as 0m and inital Y as 14.0m.

I got this: 0=14m + (-4.49m/s x t) + (-4.9 m/s/s x t^2)

I solved for t and always get 1.29s as the possible root. My friend says its incorrect and it seems incorrect to me as well since that would mean the snow ball lands a hefty 7 meters away from the roof.

Help?

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# Homework Help: Snowball off of a roof

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