What is the kinetic Energy of an 85 lb. (38.56 kg) child that has jumped off a platform 15 meters high and is falling with a velocity of 10 m/s due to gravity (9.8 m/s?) * O 5,668.2 J O J 4,250 J O 1,928 J O 12,495 J

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.