Fast and Furious!

Classical Mechanics Level 2

The car drives straight off the edge of a cliff that is 57 m high. The investigator at the scene of the accident notes that the point of impact is 130 m from the base of the cliff. How fast was the car traveling when it went over the cliff?


The answer is 38.

Kowshik Dey by kowshik dey , 20, Bangladesh

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2 solutions

Shubhendra Singh
Mar 11, 2014

by applying the formula of projectile from height: time=under root of 2H/g=3.4 Speed=Distance/time=130/3.4=38m/s

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oh cmon....dey shold have mention u can use g as 10...

Sayam Chakravarty - 7 years, 2 months ago
Arijit Banerjee
Mar 12, 2014

from vertical distance travelled we get the time 57 = 1/2 * g * t^2 ... from this we get t = 3.4 s .... now from the horizontal distance travelled 130 = u t we get the speed (u) = 130/3.4 = 38.23... which is nearly equal to 38 m/s ...It should have been mentioned in the question to round off the answer to nearest integer!

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