1. Calculate the potential energy of a 68kg person at the top of flight of stairs that 3.2 meters above the ground .
2. A 70 kg man is walking at a speed of 2.0 m/s . What is his Kinetic Energy?
3. A 60 kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational potential energy does she have at the top of the building?
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Answers
Answer:
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Given - 1. Calculate the potential energy of a 68kg person at the top of flight of stairs that 3.2 meters above the ground .
2. A 70 kg man is walking at a speed of 2.0 m/s . What is his Kinetic Energy?
3. A 60 kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational potential energy does she have at the top of the building?
Find - 1. Potential energy
2. Kinetic energy
3. Gravitational potential energy
Solution - Assuming acceleration due to gravity be 10 metre/second².
1. Formula of potential energy is m*g*h
Keeping the values in formula to calculate potential energy = 68*10*3.2
Potential energy = 2176 Joules
2. Formula of kinetic energy is 1/2*m*v².
Kinetic energy = 1/2*70*2*2
Kinetic energy = 140 Joules
3. Potential energy = 60*10*74.8
Potential energy = 44,880 Joules.
Hence, potential energy is 2176 Joules, kinetic energy is 140 Joules and potential energy is 44,880 Joules.