If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it
a-800 j
b-784 n-m
c-800 n-m
d-7840 j
e- 200 j
PE is measured in J or N-m
PE = mgh
so would the answer be B
To determine the potential energy of an object, you can use the formula:
Potential Energy = Mass × Gravity × Height
In this case, the mass is 40 kg, the height is 20 meters, and the gravity on Earth is approximately 9.8 m/s².
Let's substitute the values into the formula:
Potential Energy = 40 kg × 9.8 m/s² × 20 meters
Now we can calculate the potential energy:
Potential Energy = 7,840 joules
Therefore, the potential energy of the mass before Sam dropped it is 7,840 joules.
Therefore, the correct answer is d- 7,840 J.