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It is denoted by “g”.

The gravitation of gravity on the surface of the earth at sea level is 9.8 m/s^2. The value of g is dependent on the location. As we move above the surface of the earth the value of g will be decreasing.

As we know that, F(grav) = m*g

And F(grav) =

d^2

Therefore, Acceleration of gravity, g =

d^2

Where, F(grav) = Gravitational force

G = Gravitational constant

M = Mass of earth

m = mass of object on earth

d = distance from the center of the object to the center of the earth.

Initial velocity, v = 0 m/s

Time taken, t = 25 sec

Acceleration due to gravity, a = g = 9.8 m/s^2

Now, we can use the equation for distance (or height)

H = vt + ½ at^2

= 0 + ½ (9.8) (25)^2

= 612.5 m

Height travelled by the apple, h = 25.4 m

Initial velocity, v = 0

Acceleration due to gravity, g = 9.8 m/s^2

Now, we can use the equation for distance (or height)

H = vt + ½ at^2

25.4 = 0 + ½ (9.8) (t)^2

Time, t = 2.27 sec