Answer:
2.51seconds
Explanation: Given that,
Mass = 980kg, Power = 55kw = 55000w , height = 4×3.6 = 14.4m g = 9.8m/s^2, time= ?
Energy consumed = mass×g×height
Energy consumed = 980×9.8×14.4
Energy consumed = 138297.6joules
Where power = Energy consumed/time
55000 = 138297.6joules÷ time
55000t = 138297.6
t = 138297.6÷55000
t = 2.51seconds
The time to complete the trip from the 4th to 8th floor is 2.51seconds
