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CBSE-XI-Physics

05: Newton's Laws of Motion

with Solutions - page 4
Qstn# iii-7 Prvs-QstnNext-Qstn
  • #7
    If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may be
    (a) going up with increasing speed
    (b) going down with increasing speed
    (c) going up with uniform speed
    (d) going down with uniform speed
    digAnsr:   c,d
    Ans : (c) going up with uniform speed
    (d) going down with uniform speed
    Tension in the cable = Weight of the elevator
    Or, total upward force = total downward force
    That is, there's no acceleration or uniform velocity.
    So, the elevator is going up/down with uniform speed.
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