Aball is launched from the ground with a horizontal speed of 30 m/s and a vertical speed of 30 m/s. what is the ball’s overall speed at the top of its trajectory?
a. 60 m/s
b. 0 m/s
c. 45 m/s
d. 30 m/s

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.