two boys, one with a mass of 60kg ad the other with a mass of 90kg, are standing still (at rest), next to each other in an ice rink. one of them pushes the other with a force of 360n. assuming the ice is frictionless: what is the acceleration of the 90kg boy?

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.