Question

4. 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 and takes off for his jump at B.
A
75 m
B
15 m
Fig. 2.20
(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 s2)​

Answer 1

Answer:

Explanation:

I.Change in the energy is m(H1-H2)*g

60*(75-15)*10

=36000J

II. K.E= 75% of 3600

=(75/100)*3600

=27000J

K.E= (1/2)mv^2

27000 = (1/2)*60*v^2

On solving we get V= 30 m/s