Please help the right answer get the and this is physical science btw Sadie rides her bike 1600 m East and then turns around and goes 800 m
West. What is her displacement?

Which type of wave can travel without a medium

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.