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I have the following problem:

A volley-ball of mass m=200g and volume V=8L is inflated ith the overpresure of delta P = 0.2x10^5 Pa. A ball was thrown upwards to the height of h=20m, fell down, hit the ground, and bounced at approximately the same height. The temperature of the surrounding air is T=300k. the specific heat of the air is c=0.7kJ/(kg K)

Estimate hte maximum temperature in the ball during the hit

**The problem i'm having:**

I don't understand what is overpressure in this context.. From what i've read on the web and the context of the question, i believe the delta P is how much over the atmospheric pressure..

Also, i'm not really sure how to approach this question.. Can someone give me a hint of what to look up? thanks alot!