Question

5. A 50 kg skydiver jumps from a height of 20 m. What would be his kinetic and potential
energies when he is halfway down! Assume g=10m/s.
6. A man of maks 60 kg climbs up 50 steps of a stair in 2 minutes. If each step is 20 cm
high, calculate the power used in climbing the stairs. I Given 10m​

Answer 1

Answer:

PE = 10000 J

KE = 20

Explanation:

formula = mgh

m = mass = 50 kg

g = gravity  = 10 m/s

h = height = 20 m

50 × 10 × 20 = 10000 J

formula = KE = 1/2 × m × v²

10,000 = 1/2 × 50 × v²

10000/50 = 1/2 × v²

200 = 1/2 × v²

400 = v²

v = 20