Numerical - Mass of body in the lift

Q.  A body exerts a force of 800 N on the floor of the lift which moves upwards with a retardation of 2 m/s2. What is mass of the body carried in the lift?
- Published on 18 Sep 15

a. 74.02 N
b. 81.54 N
c. 102.43 N
d. None of the above

ANSWER: 102.43 N

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    Discussion

  • Huzaifa   -Posted on 30 Jan 18
    The correct option should be 102.43 kg not 102.43 N
  • Sravanthi   -Posted on 15 Dec 15
    Given: Force exerted on floor = 800 N, retardation (a) = 2 m/s2

    Formula: Force = m (g +a)

    Solution:

    Force = m (g +a)

    800 = m (9.81 + (-2))

    m = 800 / 7.81

    m = 102.43 N

    Mass of the body carried in the lift is 102.43 N.

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