# Physics

A small parachute is dropped from a cliff. it falls at a constant speed rate 2 m/s. A small rock is dropped 20.0 seconds later. how far will the rock drop before it passes the parachute?

1. 👍 0
2. 👎 0
3. 👁 315
1. We want the distances fallen to be equal. The parachute falls for 20 seconds more than the rock:

2(t+20) = 4.9t^2
4.9t^2 - 2t - 40 = 0
t = 3.07

so, after about 3 seconds, the rock either passes the chute, or it hits it.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics 11th grade 2

1) A 20 kg rock is on the edge of a 100 m cliff. a. What potential energy does the rock possess relative to the base of the cliff? b. The rock falls from the cliff. What is the kinetic energy just before it strikes the ground? c.

2. ### Math

A stone was dropped off a cliff and hit the ground with a speed of 120 ft/s. Using the fact that acceleration due to gravity is −32ft/s2, what is the height (in feet) of the cliff?

3. ### math

When a skydiver jumps from an airplane, the distance d in feet the diver falls in t seconds before opening the parachute is given by the formula d=16t^2. The formula assumes that there is no air resistance. Find the time it takes

4. ### Physics

A physicist is creating a computational model of a falling person before and after opening a parachute. What boundary conditions would be important here? A. The change in kinetic and potential energy. B. The location where

1. ### Physics

A physicist is creating a computational model of a falling person before and after opening a parachute. What boundary conditions would be important here? the speed at which the person falls the location where potential energy is

2. ### physics

An object dropped from a cliff falls with a constant acceleration of 10m/s2. Find its speed 2s after it was dropped? Solution:Given ,accelaration =10m/s time=2s speed=? therfore,speed=distance travelled\total time taken

3. ### Physics

A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.90 s. How high is the cliff?

4. ### Physics

PLEASE HELP! A person throws a rock horizontally off a cliff ata a speed of 9 m/s from a point 64.8 m above the ground. How long is the rock in the air? 13.2 s 26.4 s 3.64 s(my guess) 5.14 s A package falls from an airplane in

1. ### Algebra 2 Applications

A water balloon is dropped from a cliff. Exactly 3 sec later, the sound of the balloon hitting the ground reaches the top of the cliff. How high is the cliff? (Thanks in advance for any help you can provide!)

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

3. ### physics

A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.3 later. If the speed of sound is 340 , how high is the cliff?

4. ### Physics

A skydiver, who weighs 650 N, is falling at a constant speed with his parachute open. Consider the apparatus that connects the parachute to the skydiver to be part of the parachute. The parachute pulls upward with a force of 620