Prove that acceleration due to gravity on earth is 9.8 m/s2. ( Given : G = 6.67 X 10 -11 Nm2/kg2 , mass of earth = 6 X 10 24 kg
Radius of earth = 6.4 X 10 6 m )

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

Rohit is trying to tune an instrument

Which sound characteristic is not affected by the relative motion of an object