At point A, what is the gravitational potential energy for the 40 kg skier? A is

Question

At point A, what is the gravitational potential energy for the 40 kg skier?

A is 20 m Va = 0 (at rest)

A.      7840 J

B.      19.8 J

C.      7840 J

D.      800 J

What is the kinetic energy at point A for the skier described?

A.            7840 J

B.            19.8 J

C.            7840 J

D.            800 J

What is the kinetic energy at point B for the skier described?

A.            7840 J

B.            19.8 J

C.            7840 J

D.            800 J

What is the velocity at point B for the skier described?

A.      0 m/s

B.      392 m/s

C.      9.8 m/s

D.      19.8 m/s

At point A, what is the gravitational potential energy for the 40 kg skier? A is 20 m Va = 0 (at rest) 7840 J 19.8 J 7840 J 800 J What is the kinetic energy at point A for the skier described? 7840 J 19.8 J 7840 J 800 J What is the kinetic energy at point B for the skier described? 7840 J 19.8 J 7840 J 800 J What is the velocity at point B for the skier described? 0 m/s 392 m/s 9.8 m/s 19.8 m/s

Explanation / Answer

A) GPE+mgh

=40*9.8*20

=7840 J

B) KE at point A=0.5mv^2

=0 (since velocity is 0)

c) KE=7840 J (by conservation of energy)

d)let the velocity be v.so,

0.5mv^2=PE

or 0.5*40*v^2=7840

or v=19.8 m/s

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