# science

posted by lekshmi

a stone is thrown vertically upward,went up 98m and came down.How long was it in air?

1. bobpursley

I suspect it was twice as long as it took to fall 98m.

time to fall 98m
98=1/2 g t^2
t= sqrt(2*98/9.8)
so double that, and you have it.

## Similar Questions

1. ### science

Two stones are thrown vertically upward from the ground, one with three times the initial speed of the other. Assume free fall. If the faster stone takes 9.00 to return to the ground, how long will it take the slower stone to return?
2. ### physics

a girl throws a stone vertically upward with an initial speed of 8 m/s. How high will the stone rise?
3. ### physics

A stone with mass m = 2.3 kg is thrown vertically upward into the air with an initial kinetic energy of 190 J. The drag force acting on the stone throughout its flight is constant, independent of the velocity of the stone, and has …
4. ### Physics

A stone is thrown vertically upward at 15 m/s. Neglect friction due to the air. What is the stone's velocity after 2 seconds?
5. ### Physics

A stone is thrown straight upward with a speed of 12 m/s from the edge of a 70 m high cliff. How long is the stone in the air?
6. ### Physics

A stone is thrown vertically upward from outside a window, with an initial velocity of 24.0 m/s. It moves up, and then down to the ground 420 m below the point where it started. Let `up' be positive. (a) What is the maximum height …
7. ### Physics

A stone is thrown vertically upward from outside a window, with an initial velocity of 24.0 m/s. It moves up, and then down to the ground 420 m below the point where it started. Let `up' be positive. (a) What is the maximum height …
8. ### Science

A stone is thrown vertically upward with velocity of 5 m/s,at the same time a stone is dropped from the height of 100 m,when will thy meeet each other?
9. ### physics

a stone is thrown vertically upward at a speed of 10 m/s from a cliff that is 95m high. How long will it take the stone to reach the bottom?
10. ### PSU

A 2.3kg stone is thrown from ground directly upward. the maximum height reached by the stone is 45m. Neglecting air resistance, a) with which initial speed was the stone thrown?

More Similar Questions