A scientist heats a red powder. Upon heating, a liquid and a gas form. Which type of substance is the red powder?
O A. anion
B. an isotope
O c. an element
O D. a compound

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.