Posted by **Andy** on Saturday, February 9, 2013 at 5:24pm.

A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.95 s after leaving the dock has a magnitude of 6.7 m. What is the car's speed at the instant it drives off the edge of the dock?

- Physics -
**bobpursley**, Saturday, February 9, 2013 at 6:22pm
displacement?

displacement is the change in position from top of dock to the place it hit. You can figure the vertical distance from the time fallng.

vertical fall=1/2 g t^2 solve for that.

displacemetn^2=verticalfall^2 + horizntaldistance^2

so solve that for horizontaldistance, you know the other two.

now,

speed*.95=horionaldistance

now solve for speed.

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