What is the mathematical relationship between frequency and period for a harmonic motion system?

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) determine the magnitude and direction of projectile velocity at t= 1.3s b) determine the magnitude and direction of projectile acceleration at t=1.3s

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?