An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity ? How long will the object take to came back to the earth? Assume g=10 m/s^2
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s = 500m
v = 0m/s
g = 10m/s²
using the equation,
v²=u²+2as
0 = u²+2×(-10)×500
0 = u²-10000
10000= u²
so,
u = 100m/s
Initial velocity of object = 100m/s
Now,
v = u+at
0 = 100+(-10t)
-100=-10t
t = 10seconds
Time taken by the object to come back to earth = 10seconds
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