A stone is dropped at `t=0`. A second stone, will twice the mass of the first, is dropped from the

A stone is dropped from a height equal to nR , where R is the radius of the earth, from the surface of the earth. The velocity of the stone on reaching the surface of the earth is

A stone is dropped from a building, and 2 seconds later another stone is dropped. How far apart are the two stones by the time the first one has reached a speed of 30 m/s?

From the foot of a tower 80 m high, a stone is thrown up so as to reach the top of a tower. After 2 s , another stone is dropped from the top of the tower. When and where the two stones meet?

A balloon is rising vertically upwards with uniform acceleration 15.7m/ s^(2) .A stone is dropped from it. After 4s another stone is dropped from it.Find the distance between the two stones 6 second after the second stone is dropped.

A stone is dropped in a well 107 m deep. If the splash is heard 5 seconds after the stone is dropped, then calculate the speed of sound in air.