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

A projectile launched straight up at 10 m/s will be in the air for:

A) 1 s

B) 1.4 s

C) 2 s

D) 5 s

**2. Relevant equations**

Not sure.

**3. The attempt at a solution**

I’m honestly not sure what to make of this problem. Since it’s freefall, it sounds like we could assume the acceleration to be -10 m/s^{2}. V_{0} would be equal to 10 m/s and V would equal 0 if it reaches a maximum height. If we need to find t and since we aren’t given d, can we use the equation:

v = v_{0}+at?

http://ift.tt/1cDwgx7