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physics

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In one day, a 85 kg mountain climber ascends from the 1440 m level on a vertical cliff to the top at 2360 m . The next day, she descends from the top to the base of the cliff, which is at an elevation of 1310 m .
a) What is her gravitational potential energy on the first day? If you choose the reference level for zero potential energy at:
a. the top of the cliff.
b. 1440 m level.
c. 1310 m level.
b) What is her change in gravitational potential energy on the first day?
c) What is her change in gravitational potential energy on the second day?

  • physics -

    m g (H - Ho) where mg = 85*9.81 = 834 N

    first day
    If Ho = 2360
    U at start = 834 (1440-2360)
    U at top = 834 (2360-2360) = 0
    If Ho = 1440
    U at start = 834 (1440-1440) = 0
    U at top = 834 (2360 - 1440)
    If Ho = 1310
    U at start = 834 (1440 - 1310)
    U at top = 834 (2360 - 1310)

    b) U at top - U at start
    834(2360 - 1440)

    c) U at end - U at top
    834 (1310 - 2360)

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