Question

*
(16) An object thrown vertically upwards
reaches a height of 500 m. What was its initial
velocity? How long will the object take to come
back to the earth? Assume g = 10 m/s2.
500 mg=
g = 10 m/s2
h​

Answer 1

s = 500

v = 0

a = g = -10

-u² = -20 x 500

u = 100 m/s us the initial velocity

0 = 100 + (-10)t

t = 10 sec upwards + 10 sec downward

t = 20 seconds to reach back to ground

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