please solve this problem with entropy

Just as the thermo professor was hurrying into the classroom building, a big $20kg$ bag of

sand $(c_p=1\frac{kJ}{k}g.K)$ smashed to the ground behind her, just missing her. She looked up

and saw that it fell $($or dropped$)15m$ from the roof of the brand new building next to the

car park. The first and second thoughts that crossed her mind were,

a$.$ What was $S$ of the bag of sand for this event?

b$.$ What was $S$ of the surroundings?

Will you also answer these questions, please?