NaHCO3
That is the formula for baking soda
Answer:
6370 J
Explanation:
By the law of energy conservation, the work done by the student would be the change in potential enegy from 1st floor to 3rd floor, or a change of 13 m

where m = 50kg is the mass of the student, g = 9.8 m/s2 is the gravitational constant and h = 13 m is the height difference

Preserved fossil<span> (like a fossil in amber, ice or tar.</span>
120 km/3 hours. 40/1=?/3 1x3=3 hours so 40x3=120 km