Archived Discussion > VCE Science Exams

Physics: Discussion, Questions & Potential Solutions

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Nomi16:

--- Quote from: KiNSKi01 on November 14, 2018, 01:28:30 pm ---Yeah totally stuffed up second and third part of spring question

Think answers should have been 0 m/s^2 and 0.05 metres


I reckon the answer for part b is 9.8 m/s^2 as that's the maximum acceleration due to gravity.
--- End quote ---

jpulvirenti:
what did you get for the powerloss questions

AlphaZero:
Same as yesterday.
We'll do our best to get the solutions out as quick as we can!

KiNSKi01:
Yeah that’s what I had but it’s wrong

The question asked what is the acceleration when the ball had its max velocity

Once the ball comes into contact with the spring it is still acccelerating but the value for its acceleration decreases. Once the value of acceleration reaches 0 m/s^2 (when mg=kx) the ball reaches its max velocity

I’m guessing you did the same as me and assumed that as soon as the ball came into contact with the spring it would start slowing down. Unfortunately that’s not true Ahahah

number6603:
I feel like, logically, it has to be 0 - if the acceleration is positive, then it hasn't hit its max velocity. If it's still accelerating, it's increasing velocity, and it can't be at maximum velocity if its velocity is still increasing.

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