Question

The diagram given below shows a ski jump. A skier weighing 60 kgf stands at A at the top of ski jump. He moves from A to B and takes off for his jump at B.

(a) Calculate the change in the gravitational potential energy of the skier between A and B.

(b) If 75% of the energy in part (a) becomes kinetic energy at B. Calculate the speed at which the skier arrives at B.

(Take g=10 m s^-2)

Answer 1

(a) Mass of skier= 60kg 

Loss in potential energy = mg(h₁ –h₂) 

= 60 × 10 × (75 −15) = 60 × 10 × 60 = 3.6 × 10⁴J

Comments

sir i want to ask that in this ques. 2nd part why have taken energy in part a as 3.6×10^4
as in part a P E energy is 45000