B. Pedro is a construction worker. He lifted a 40- kg sack of cement from the ground to his shoulder at a height of 1.75 m. How much potential energy does the sack of cement have at this height? 6. Given: 7. Required: 8. Formula: 9. Solution: 10. Answer:
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Answer:
Given: 40kg and 1.75m
Reguired: potential energy
Formula: PE grav.=m*h*g
m=mass
h=height
g=gravitational field strenght (9.81 m/s on earth)
Solution: (40kg) (9.81m/*2) (1.75m)=686 Joules
Answer: 686 J