A girl is on a ride at an amusement park. She is 30m above the ground and is ascending vertically at 5.0 m/s. While she is ascending, she holds her arm out and releases a penny. How long does it take th penny to reach the ground?
The Attempt at a Solution
a=-9.8 m/s^2 (Letting up be positive.)
0=30m+50m/s t+0.5(-9.8 ,/s^2) t^2
For the quadriatic formula, C= 30 m, B=50 m/s, and A= -4.9 m/s^2
After using the formula the positive answer is t≈10.79 s. Is this correct? Thanks for a reply!