# Physics

posted by .

A stone is thrown from a 50m high cliff and lands 5 seconds later, 40m from the base of the cliff. At what speed and angle was the stone thrown?

• Physics -

The horizontal velocity component must be Vx = 40/5 = 8 m/s

The initial vertical component Voy must satisfy this equation

Voy*T - (g/2)T^2 = -50
where T = 5 s, so

Voy = 14.5 m/s

Speed when thrown = sqrt(Voy^2 + Vx^2]
= sqrt[(14.5)^2 + 8^
= 16.6 m/s

The ratio Voy/Vx is the tangent of the launch angle

## Similar Questions

1. ### Physical Sciences

A stone is thrown from a 50m high cliff and lands 4 seconds later, 40m from the base of the cliff. At what speed and angle was the stone thrown?
2. ### Physics ?#2

A ball is dropped from the top of a 53.0m high cliff. At the same time, a carefully aimed stone is thrown straight up from the bottom of the cliff with a speed of 25.0m/s The stone and ball collide part way up. How far above the base …
3. ### physics

a physics book is thrown horizontal at a velocity of 10.0m/s from the top of a cliff 78.4 m high. a). how long does the stone take to reach the bottom of the cliff?
4. ### physics

A stone is thrown horizontally from a cliff 25m high and lands on the ground 22 m from the foot of the cliff. What is the horizontal acceleration on the stone?
5. ### Physics

A stone is thrown at an angle of 30 degrees above the horizontal from the top of a cliff with an initial speed of 12 m/s. If it hits the ground 4.6 seconds later, what is the height of the cliff?
6. ### Physics

A stone is thrown at an angle of 30 degrees above the horizontal from the top of a cliff with an initial speed of 12 m/s. If it hits the ground 4.6 seconds later, what is the height of the cliff?
7. ### Physics

Help imediately please very urgent! A stone is dropped from a cliff 200m high,if a second stone is thrown vertically upwards 1.50sec after the first was released,strike the base of the cliff at the same in stant as the first stone,with …
8. ### mechanics

a stone is dropped from a cliff 200m high.if a second stone is thrown verticall upwards 1.50seconds after the first was released.strike the cliff base at the same instant as the first stone.with what velocity was the second stone thrown
9. ### physics

A stone is dropped from the top of a cliff which is 100m high. At the same time another stone is vertically thrown upwards from the foot of the cliff woth a speed of 40m/s.AT what height and when do the stones meet
10. ### Maths

A stone is thrown up at an angle of 30degrees to the horizontal with a speed of 20metres per second from the edge of a cliff 15m above sea level, so that the stone lands in the sea. Find how long the stone is in the air and how far …

More Similar Questions