At t = 3 s, a certain particle has a speed of 10 m/s and is moving at an angle of 30∘ above the +x axis. At t = 6 s the same particle is moving at 5 m/s straight down at angle of 90∘ below the +x axis. Calculate the magnitude of its average acceleration.

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?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?