Two stones are launched from the top of a tall building. One stone is thrown in a direction 15.0 ∘∘ above the horizontal with a speed of 20.0 m/sm/s ; the other is thrown in a direction 15.0 ∘∘ below the horizontal with the same speed.

Which stone spends more time in the air? (Neglet air resistance)

a. The stone thrown upward spends more time in the air.

b. The stone thrown downward spends more time in the air.

c. Both stones spend the same amount of time in the air.

a

Explanation:

Given

First stone is thrown above the horizontal with some speed let say u

Second stone is thrown at below the horizontal with speed u

For a height h of building

For first stone (motion in vertical direction)

using

where v=final velocity

u=initial velocity

a=acceleration

h=displacement

For second stone

Equating 1 and 2

as cannot be zero

so

therefore time taken by first stone(thrown upward) will be more.

the higher the current the higher the mag field around it the higher the influence on the compass

-4 on