I NEED HELP ASAP A marble at rest is dropped from a tall building. The marble hits the ground with a velocity of 98 m/s. How long was the marble in the air? (Remember: The acceleration due to gravity on Earth is 9.8 m/s2)
O 10 seconds
O 960.45
O 1.05
O 0.1 second​

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

List four observations that indicate that a chemical reaction may be taking place

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90