Atrain travel 82 kilometers in 2 hours and then 62 kilometers in 3 hours . what is its average speed?

Average speed = Total distance ÷ Total time taken

Total distance = 82km + 62km = 144km

Total time taken = 2hrs + 3hrs = 5hrs

Average speed = 144km ÷ 5hrs = 28.8km/hr.

from 1609, galileo galilei used the recently invented telescope to observe the sun, moon and planets. he saw the mountains and craters of the moon, and for the first time revealed the planets to be worlds in their own right. galileo also provided strong observational evidence that planets orbited the sun.

his discoveries about the moon, jupiter's moons, venus, and sunspots supported the idea that the sun - not the earth - was the center of the universe, as was commonly believed at the time.galileo turned his gaze toward venus, the brightest celestial object in the sky - other than the sun and the moon.

when earth is in rotational motion around the sun,it displaces from its place.

when a ball is placed on an inclined surface it does both the rotational and circular motion.

explanation: