Question

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 ​

Answer 1

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

Cheers!

Answer 2

Answer:

Hope this will help you.