A hockey player has an acceleration of -3.1 m/s2. How long does it take him to come to a complete stop from a speed of 13 m/s? A. 9.9 s
B. 16.1 s
C. 0.24 s
D. 4.2 s

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.