A 20 kg chair has 250 J of potential energy relative to the ground. If the chair is dropped from its rest position, what is its speed when it strikes the ground?

Aparticle with mass 1.81×10−3 kg and a charge of 1.22×10−8 c has, at a given instant, a velocity v⃗ =(3.00×104m/s)j^. what are the magnitude and direction of the particle’s acceleration produced by a uniform magnetic field b⃗ =(1.63t)i^+(0.980t)j^?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? a b c d