Saturday

April 18, 2015

April 18, 2015

Posted by **Anonymous** on Wednesday, May 12, 2010 at 9:50pm.

- Physics -
**Damon**, Wednesday, May 12, 2010 at 10:02pmTime 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 3-2.86 = .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

**Answer this Question**

**Related Questions**

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 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 - Soccer player #1 is 7.31 m from the goal, as the figure shows. If she ...

physics - Soccer player #1 is 7.31 m from the goal, as the figure shows. If she ...

physics - Soccer player #1 is 8.6 m from the goal. If she kicks the ball ...

Physics - A soccer player kicks a rock with an initial velocity of 0.50 m/s from...

Physics - A rock is dropped from a sea cliff 400m high.If the speed of sound is ...