# GCSE Physics help!

Hi, I’m just struggling on a physics gcse question and would really appreciate it if anyone could provide some guidance on how you answer the question (step by step if possible). I’ve done the first part of the question but just need help on question 3. (3.2).

Here’s the link to the image of the question:

https://ibb.co/z6MsR6Y

Would appreciate any support/guidance.
2 times the velocity means 22 times the kinetic energy.
Original post by Sazzysz7
Hi, I’m just struggling on a physics gcse question and would really appreciate it if anyone could provide some guidance on how you answer the question (step by step if possible). I’ve done the first part of the question but just need help on question 3. (3.2).

Here’s the link to the image of the question:

https://ibb.co/z6MsR6Y

Would appreciate any support/guidance.

An approach to 3.2 would be:

1.

Determine the initial speed of child A’s ball bearing using 3.1 answer.

2.

Next, compute the initial KE of child B’s ball bearing.

3.

Lastly, use conservation of energy where elastic potential energy is converted into kinetic energy to find the spring constant.

If you are good with algebra, you are not required to compute the initial speed of child A’s ball bearing and the initial KE of child B’s ball bearing. The spring constant of child B's elastic band is related to the spring constant of child A's elastic band by a simple equation.