A stone is thrown horizontally with an initial speed of 7.5 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top pf the cliff to the bottom to be 2.5 s. What is the height of the cliff?

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- Jul 17th 2006, 11:03 PMbabygirlHello!
A stone is thrown horizontally with an initial speed of 7.5 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top pf the cliff to the bottom to be 2.5 s. What is the height of the cliff?

- Jul 17th 2006, 11:20 PMmalaygoelQuote:

Originally Posted by**babygirl**

Solving, h=31.25m(g=10m/s^2)

Malay - Jul 18th 2006, 07:28 AMSoroban
Hello, babygirl!

Quote:

*A stone is thrown horizontally with an initial speed of 7.5 m/s from the edge of a cliff.*

This can be replaced with "A stone is dropped from the edge of a cliff."

A stopwatch measures the stone's trajectory time from the top of the cliff

. . to the bottom to be 2.5 s. .What is the height of the cliff?

A horizontal initial speed has*no effect*on the stone' descent.

Malay's solution is absolutely correct . . .