Physics Help Required

Question

What is the downward velocity of a freely falling object after 17.0 seconds of free fall?

Answer 1

One of Newton's kinematic equations of motions is:

v_f = v_i + at where v_f is the final velocity (in this case, the velocity after 17 seconds), v_i is the initial velocity (in this case zero), "a" is acceleration (in this case, that is the acceleration due to gravity which on the earth's surface is -9.81 m/s²), and "t" is the elapsed time (in this case 17 seconds) so:

v_f = 0 + (-9.81)(17.0)

v_f = 167 m/s