Question

A) 16. (5 pts) A carpenter tosses a hammer vertically to a friend working on a roof 25 ft above him Draw a diagram showing relevant information, including initial and final velocity. B) With what speed must he toss the hammer upward for the friend to easily catch it? C) If the friend does not catch the hammer, how long will it be in the air before returning to the original height from which it was released?

Answer 1

B) for friend to easily catch it Rightarrow g = 32.17 f_t/s^2 v_2 = 0, S0, v_1 = squareroot 2gH Rightarrow v_1 = squareroot 2 times 32.17 times 25 v_1 = 40.11 f_t/s c) total time hammer in the air Rightarrow t = 2v_1/2 Rightarrow t = 2 times 40.11/32.17 Rightarrow t = 2.2s