Question

A skier weighing 60kgf stands at A at the top of ski jump. He moves from A and takes off for his jump. (g = 10m/s2) i) The change in the gravitational potential energy of the skier between A and C​

Answer 1

Explanation:

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Answer 2

Answer:

(a) 3.6×10^4J

(b) 30m/s

Explanation:

A skier weighing 60kgf 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 = 10m/s−1)

Is this the complete question?

If yes the answer is given below..

Mass of skier = 60kg

(a) Loss in potential energy =mg(h'-h)

= 60×10×(75−15)

= 60×10×60 = 3.6×10^4J

(b) Kinetic energy at B = 75/100 × 3.6 × 70^4 = 27000J

= 2.7 × 10^4J

Kinetic energy = 1/2mv^2

27000 = 1/2mv^2

27000 = 1/2 × 60 × v^2

v^2 = 27000/30 = 900

v = 30m/s

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