A 10 kg object is lifted to a height of 4 m above the ground. Calculate its gravitational potential energy.
Then, calculate the efficiency:
Solution:
GPE = m × g × h
Efficiency = (Work done / Energy input) × 100% A 10 kg object is lifted to a height of 4 m above the ground
GPE = m × g × h = 10 kg × 9.8 m/s^2 × 4 m = 392 J
W = F × s = 50 N × 2 m = 100 J
where m is the mass of the object, g is the acceleration due to gravity (approximately 9.8 m/s^2), and h is the height of the object above the ground.