A physics question

HI,

Could someone tell me how to do the question

#2
http://members.shaw.ca/barry-barclay/Self-Tests/test11/Magnetic%20Force%202.htm
I don't know why the current direction is Y.

And

A car travels at a uniform speed through a level circular curve in the road. Which of the following correctly describes the magnitude of the acceleration, velocity and force acting on the car?

Answer: Acceleration: same

Velocity: same

Force: same

I don't know why velocity is same.

Thank you

Re : A physics question

When a moving object stops, its change in momentum is -100 kg m/s.what impulse is associated to the stopping of the object

Re : A physics question

F=mv/t
Ft=mv
ft=-

100kgm/s
impulse is -100kgm/s