The acceleration due to gravity is is 3.59 on Mercury how far would a rock 39g fall from rest in 8.5 s

Which of the following is an example of units for speed

An owl dives toward the ground with a constant velocity of 4.40 m/s at 53.0° below the horizontal. the sun is directly overhead and casts a shadow of the owl directly below it. what is the speed (in m/s) of its shadow on level ground?

Why should the wavelength scale of spectroscope be calibrated