Acar traveled at a constant velocity of 70 mph from noon to 2: 00 pm. at 3: 00 pm the velocity of the car was 80 mph; and finally at 4: 30 pm the velocity of the car was 40 mph. calculate the acceleration of the car between 3: 00 and 4: 30 pm. a) -40 mi hr2 b)-26.67 mi hr2 c)26.67 mi hr2 d) 40 mi hr2

Acceleration is the result when the difference in final and initial speed is divided by time. From the given, the acceleration from 3:00 to 4:30 pm is calculated through the steps below,
                             acceleration = (40mph - 80 mph) / 1.5 h
                                                     -26.67 mi/h²
Thus, the answer is letter B. 

The reflection of the candle in the concave mirror formed an upside-down virtual image that is smaller than the candle.in other words. the answer is the third option, c

Planck decided to assume that atoms could only vibrate at certain frequencies that were whole numbers eg 2f, 3f and so on. others used to think that atoms vibrate continuously