Question

a stone is thrown vertically upward.It takes 30 seconds to return to the ground. How high does the stone go?​

Answer 1

Answer:

Step-by-step explanation:

Before starting

We are considering g=10m/s²(be sure with negative sign)

t=30 sec

We knw that when a body reaches maximum height its velocity becomes 0

So ,

Using first equation of motion,

v=u+at ..... (a=g)

0=u+(-10)×30 ........ (gravity acts always downwards)

u=300m/s.

Now,

Using last equation of motion,

v²-u²=2as

0-300= 2 ×(-10)×height

Height =15 m

Hence, the stone would rich 15 m.