Posted by Anonymous on Wednesday, May 12, 2010 at 9:50pm.
A soccer player kicks a rock horizontally off the a 40 m high cliff into the pool of water. if the player hears the sound of the splash 3 sec., what is the initial speed given to the rock? Assume the speed of the sound in air to be 343 m/s.

Physics  Damon, Wednesday, May 12, 2010 at 10:02pm
Time for rock to fall 40 meters?
d = (1/2) a t^2
40 = (1/2)(9.8) t^2
t^2 = 8.16
t = 2.86 seconds
so the sound traveled for 32.86 = .143 seconds
so the rock hit 343*.143 = 49 meters away
that is hypotenuse of angle
with leg 40 and other leg is horizontal distance d from bottom of cliff to splash
d = sqrt (49^2 40^2)
d = 28.3 meters
so rock hit 28.3 meters from cliff base in its 2.86 meters in the air
speed = distance/time = 28.3/2.86 = 9.9 m/s

Physics  Wai, Tuesday, February 2, 2016 at 1:55am
sample answer step by step
Answer This Question
Related Questions
 physics  a soccer player kicks a rock horizontally off a 40.0mhigh cliff into...
 physics  A soccer player kicks a rock horizontally off a 40.0 m high cliff into...
 physics  A soccer player kicks a rock horizontally off a 41.7 m high cliff into...
 physics  A soccer player kicks a rock horizontally off a cliff 42.9 m high into...
 physic  Question Part Points Submissions Used A soccer player kicks a rock ...
 Physics  A boy kicks a rock off a cliff with a speed of 19.4 m/s at an angle of...
 Physics  A rock is dropped from a sea cliff 400m high.If the speed of sound is ...
 Physics  A boy kicks a rock off a cliff with a speed of 15.5m/s at an angle of ...
 Physics  A soccer player kicks a rock with an initial velocity of 0.50 m/s from...
 pyhsics  A man drops a rock off the side of a cliff, and hears it hit the ...
More Related Questions