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- #1

1)If y represents a trajectory of a particle, show the speed of the particle is constant.

2)Show that the component of the particle's velocity in the direction of the vector B is also constant.

My thoughts: For 1) I think I may need to show that y''(t) is normal to y(t).

For 2) If y'(t) is in the direction of B, then is y'(t) x B=0.