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A rock is dropped from the top of a cliff what is the velocity after 2 seconds 5 seconds 10 seconds?
Wiki User
∙ 14y ago
Since the equation for time=sqrt(2h/g)
set 2 seconds for time and 9.8 for gravity
so 2=sqrt(2h/9.8)
clear the sqrt by squaring both sides
4= 2h/9.8
9.8*4 =2h
(9.8*4)/2 = height.
now that you have the height, you can do v=distance/time
v=height from the equation prior/2 seconds
i hope that works..
Wiki User
∙ 16y ago
Wiki User
∙ 14y agoFormula: V(final) = V(initial) + at -a=acceleration=9.8m/ss, t=time Assuming the initial velocity is 0 (the rock was just dropped and not thrown)... 2 seconds - velocity = 19.6 m/s 5 seconds - velocity = 49 m/s 10 seconds - velocity = 98 m/s
Wiki User
∙ 14y agoAcceleration of gravity is 9.8 meters (32.2 feet) per second2.
After 2.5 seconds, the object has reached a speed of (2.5 x 9.8) = 24.5 m/s . . . . . (2.5 x 32.2) = 80.5 ft/sec
Wiki User
∙ 15y ago68.6 m/s.
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What does initial velocity means?
initial velocity is the velocity with which a particle starts its journey.
A 12 kg rock falls from rest off a cliff and hits the ground in 1.5 s What is the velocity?
The acceleration of gravity is 9.8 meters/sec2.In 1.5 seconds after it's dropped, any object is falling at (9.8 x 2) = 19.6 meters/sec.The mass of the rock makes no difference.
What is the displacement and velocity of a rock dropped from rest after 4s?
The displacement and velocity of a rock that is dropped from rest after 4s, is 6 km/h. This can vary depending on the speed of the rock, and the surroundings.
A rock is dropped from a height of 80 m and is free fall what is the velocity of the rock as it reaches the ground 4.0 secounds later?
39 m\s downward
A rock falls from a cliff 144 ft high How long does it take the rock to reach the ground?
an object will fall at around 50ft every second, so around 3 seconds.
A rock is dropped from a cliff and hits the ground 6.0 seconds later How high is the cliff?
176.4 meters
Suppose a rock is dropped off a cliff with an initial speed of 0 What is the rock's speed after 5 seconds in if it encounters no air resistance?
49
If a Rock is dropped off a cliff with an initial speed of 0 ms What is the rock's speed after 3 seconds in ms if it encounters no air resistance?
speed is decided by v = a(t), where t is your time variable and a is your acceleration constant. after 3 seconds, your velocity v = (9.8m/s2)(3s) = 29.4m/s
Suppose a rock is dropped off a cliff with an initial speed of 0 ms What is the rock's speed after 3 seconds in ms if it encounters no air resistance?
29.4
Suppose a rock is dropped off a cliff with an initial speed of 0 ms What is the rock's speed after 5 seconds in ms if it encounters no air resistance?
49
What does initial velocity means?
initial velocity is the velocity with which a particle starts its journey.
A 12 kg rock falls from rest off a cliff and hits the ground in 1.5 s What is the velocity?
The acceleration of gravity is 9.8 meters/sec2.In 1.5 seconds after it's dropped, any object is falling at (9.8 x 2) = 19.6 meters/sec.The mass of the rock makes no difference.
What is the displacement and velocity of a rock dropped from rest after 4s?
The displacement and velocity of a rock that is dropped from rest after 4s, is 6 km/h. This can vary depending on the speed of the rock, and the surroundings.
A cliff diver plans to jump off a cliff into a river and needs to know the velocity with which she will strike the water. it takes a rock 2.5 seconds to reach the water. what'ld her final velocity be?
80 ft / sec ~ 55mph The above ignores air resistance which will not be significant at this speed.
How high is the cliff if a rock is dropped and you hear the sound after 7 seconds?
S=ut+0.5*a*t2 s=displacement u=intial velocity=0m/s t=time=7seconds a=9.81m/s2 s=0*7+0.5*9.81*72 s=240.345m
Suppose a rock is dropped off a cliff with an initial speed of 0 miles per second What is the rock's speed after 5 seconds in miles per second if it encounters no air resistance?
,033
A rock is thrown from a cliff and hits the ground 5 seconds later at a distance of 50 meters from the cliff How high was the cliff?
Assuming you throw the rock horizontally off the cliff it drops down at the acceletrtion of gravity. height= 1/2 gt^2 With g = 9.8 m/sec and t = 5 seconds we have height = (1/2) (9.8)(5)(5) = 122.5 meters notice it has nothing todo with the 50 meter distance, which depends on the horizontal velocity.
