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Change in velocity of a body in unit time is called acceleration. If the velocity change is positive it will be acceleration but if it is negative it will be decelerating. It is denoted by “a”.

a =

time

or, a =

t

Other formulas:

a =

2S

a =

t^2

Its S.I unit is m/s^2.

Initial velocity, v1 = 25 m/s

Final velocity, v2 = 0 m/s

Distance travelled, s = 12.4 m

Now we have the formula for acceleration,

a =

2S

= 0 – (25)^2/2(12.4)

= 125/24.8 = 5.04 m/s^2

Calculate the height of the bridge from the water level.

Initial velocity, v1 = 0 m/s

Time taken, t = 8 sec

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

Now, we have the equation for distance,

Height, h = vt + ½ at^2

= 0 + ½ (9.8) (8)^2

= 313.6 m