Question

A cargo helicopter, descending steadily at a speed of 2.0 m/s, releases a small package. Let upward be the positive direction for this problem.

(a) If the package is 18 m above the ground when it is dropped, how long does it take for the package to reach the ground?

(b) What is its velocity just before it lands? (Indicate the direction with the sign of your answer.)

Answer 1

Initial velocity of the package,

Initial height of the package,

FInd time of flight

Use formula

When the package reaches the ground, becomes zero.

Put negative sign for because is acting downwards the same direction as the initial velocity

Solve the quadratic equation with a calculator

(a) ANSWER:

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(b) Final velocity

Use formula

(b) ANSWER:

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