Astone is thrown straight up from the ground with an initial speed of 15.2 m/s. at the same instant, a stone is dropped from a height of h meters above ground level. the two stones strike the ground simultaneously. find the height h. the acceleration of gravity is 9.8 m/s 2 . answer in units of m.

47 m

Explanation:

Time of flight of stone thrown up = time of fall of stone dropped down.

Time of flight = 2u /g

where u is initial velocity and g is acceleration due to gravity.

= 2 x 15.2 / 9.8

=3.10 s.

For fall of second stone

time of fall t = 3.1 s

Height h = ?

h = ut + .5 g t²

= 0 + .5 x 9.8 x 3.1 x 3.1

= 47 m

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation: