A school student of mass 50kg climbs a staircase of height 3m while carrying a bag of mass 5kg. Take g=10m/s2.
a. (i) Calculate the total work done against gravity while the student reaches the top.
b. (ii) The student’s average power output during the climb is 150W. Determine the minimum time taken to complete the climb.
c. (iii) Express the time obtained in part (ii) in both seconds and minutes (rounded to two decimal places).