Andrew is stopped at the top of a hill and then begins coasting down the hill on his skateboard. After 5.2 seconds he reaches a speed of 6.5 m/s. What is Andrew's average acceleration?

Bradley was working in the lab. he accidentally poured a container of concentrated hydrochloric acid into his container of distilled water. not thinking much of it, he continued with his work as if nothing happened. which of these would be the result of this laboratory accident? a) the water will change to a bright pink color. b) the new solution would decrease in temperature. c) the solution has now become a good conductor of electricity. d) hcl and water have the same chemical and physical properties, so nothing would happen.