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Old Sep 20th 2009, 07:35 PM   #1
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Mastering Physics car moving off a cliff

A stunt man drives a car at a speed of 20m/s off a 30-m-high cliff. The road leading to the cliff is inclined upward at an angle of 20 degrees.

1)How far from the base of the cliff does the car land?

2)What is the car's impact speed?


plz help me i am so confused
thx in advance!
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Old Sep 21st 2009, 12:31 AM   #2
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Please post an attempt or specify what is confusing.

Here are a few hints anyway.

Resolve the velocity v into its components

vertical component = v sin 20 ; horz component = v cos 20.

Treat these two components independently.

Treat the horizontal component as if it is not affected by gravity.

Split the total time T taken into 2 parts T1 and T2. (i.e. T = T1 + T2)

T1 is the time taken to reach max height say h above the cliff, and

T2 the time taken to fall thru a height of (h +30) m.

1) The answer for this is (20 cos 20) T.

2) For this find the final velocity (of the vertical component)

and then find its vector sum with 20 cos 20.

Look at previous threads in this section .Similar problems have been solved.
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