A 9 kg stone drops from a height of 20 meters. What is its velocity when it hits the ground? A.) 17.2 m/s

B.) 21.2 m/s

C.) 19.8 m/s

D.) 16.1 m/s

Hey student studies gravity using objects that have the same mass which two objects have the greatest gravitational force acting between them a. 100kg 1.0m 100kg b. 100kg 2.0m 100kg c. 100kg 2.0m 100kg big d. 100kg big 3.0m 100kg big

If a rock is thrown upward on the planet mars with a velocity of 10 mys, its height in meters t seconds later is given by y − 10t 2 1.86t 2 . (a) find the average velocity over the given time intervals: (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001] (b) estimate the instantaneous velocity when t − 1.

Suppose you hit your hand against the edge of table. using newton’s third law of motion why does my hand hurt? explain