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Particles A level physics

I'm really confused on how to do this question
This is the answer:
)8.1 × 10^−8 = 9.1 × 10^−31 × v2/5.3 × 10^−11
Or (v2 =) 4.72 × 10^12 seen
2.17 × 10^6 (m s−1)
Original post by r.maliak
I'm really confused on how to do this question
This is the answer:
)8.1 × 10^−8 = 9.1 × 10^−31 × v2/5.3 × 10^−11
Or (v2 =) 4.72 × 10^12 seen
2.17 × 10^6 (m s−1)

What is your confusion?
Reply 2
Original post by Eimmanuel
What is your confusion?

the answer said to use F = mv^2/r but ive never seen that equation before
Original post by r.maliak
the answer said to use F = mv^2/r but ive never seen that equation before

Have you studied circular motion?
Reply 4
Original post by Eimmanuel
Have you studied circular motion?

nvm yh i get it now thx anways

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