The y-component of a projectile’s velocity is 12.1 m/s. when the projectile once again passes by the height from which it was launched, what is the y-component of its velocity? impossible to calculate without knowing the x-component 0 m/s 12.1 m/s -12.1 m/s

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star