The velocity is a vectorial quantity, whereas speed is a scalar quantity, meaning it depends on the direction!
As such, the velocity is changing because the direction is changing.
The correct answer is D. learn to do a task independently.
Answer:
Keep going you are doing great, if you need a break go take a short walk
Answer:

Explanation:
As we know that when charge particle is projected in perpendicular magnetic field then the radius of the charge particle is given as


now we have

since here radius of proton and electron will be same
so we will have


so we have

given that



so we have

