A ball is rolling horizontally at 3. 00 meters per second as it leaves the edge of a tabletop 0. 750 meter above the floor. The ball lands on the floor 0. 391 second after leaving the tabletop. What is the magnitude of the ball’s acceleration 0. 200 second after it leaves the tabletop?.

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

Apopulation of deer mice was introduced into a desert ecosystem. being dark-colored, the deer mice stood out in the sand and were easy prey for predators. over a few years, the color of the mice changed from dark brown to light brown. what role does natural selection play in this example? a. the change of color camouflaged them, which them hunt better. b. the change of color enabled them to regulate their body temperature. c. the change of color allowed them to hide better from predators. d. the change of color made their bodies tolerant to the harsh desert sand. e. the change of color allowed them to deflect the excessive heat.

If you are in grade when should you start studying for exams