A seven grader launched a toy rocket at 27 m/s straight up in the air. The...

Question

Question

A seven grader launched a toy rocket at 27 m/s straight up in the air. The rocket in its return fell 20m below where it was launched. Determine:

A) the time it was in the air

B) its velocity when it reached the ground below.

Answer 1

Answer #1

A. By motion 2nd equation,

Sy= uy*t+ 0.5mv^2

-90=27t-49t^2

t= 7.85 second

B. Vf= sqrt(27^w(2*9.8*20))

Vf= 33.48 se onds

Answer 2

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