February 21, 2017

Homework Help: Calculus

Posted by Sam on Wednesday, November 16, 2011 at 12:30am.

this homework is due in one hour and i have no idea how to answer these questions.

1. A car is traveling at 50 mi/h when the brakes are fully applied, producing a constant deceleration of 20 ft/s^2. What is the distance covered before the car comes to a stop?

2. A stone is dropped from the upper observation deck of a tower, 450 m above the ground. (Assume g = 9.8 m/s^2.)
(A)If the stone is thrown downward with a speed of 8 m/s, how long does it take to reach the ground? (Round your answer to two decimal places.)

3. Find a function f such that f '(x) = 3x^3and the line 81x + y = 0 is tangent to the graph of f

4. Two balls are thrown upward from the edge of a cliff 432 ft above the ground. The first is thrown with a speed of 48 ft/s and the other is thrown a second later with a speed of 24 ft/s.
(A)If they pass each other, give the time when this occurs. If they do not pass each other, enter NONE.

I have seventy percent of the assignment done but i cant figure these out. any help would be awesome

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