A velocity vs. time graph for an object is shown. Which parts of the graph represents the object
moving at a constant, positive acceleration?
Velocity vs Time
O W and X
25
O X and Y
20
Y
O Y and Z
15
O W and Z
Velocity (m/s)
10
Z
w
5
0
0
1
2
4
5
3
Time (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.