Answer:
Work = 92,704.5 joules
Power= 154.5 watts
Explanation:
Given that:
Time= 10 minutes
treadmill grade = 15% = 0.15
horizontal speed = 90 meters/min
subjects weight = 70 kg
To calculate the total work, we have;
work = force × distance
force = mass × acceleration
= 70 × 9.81
= 686.7N
Also, distance = speed × time × fractional treadmill grade
∴ distance = 90 meters/min × 10 min × 0.15 (treadmill grade)
Total work can therefore be calculated as:
work = force × distance
work = 686.7N × (90 meters/min × 10 min × 0.15 (treadmill grade) )
Work = 92,704.5 N/m
Work = 92,704.5 joules
To calculate the power, we have;
Power = workdone/time
Power = 92,704.5 joules/600 seconds
Power = 154.5 joules/second
Power= 154.5 watts
