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Q: If a girl with a weight of 40 N, climbs on the rope for 20 seconds with the power of 160 watts, then at which height will she reach?
  • A. 80 meter
  • B. 4 meter
  • C. 8 meter
  • D. 0.8 meter
Correct Answer: Option A - Let assume that girl climbs to the h meter. Then, power = potential energy (work)/time P = (mgh)/t Here, weight (mg) = 40N,t = 20 sec., Power (P) = 160W 160 = (40xh)/20 h = 80 meter
A. Let assume that girl climbs to the h meter. Then, power = potential energy (work)/time P = (mgh)/t Here, weight (mg) = 40N,t = 20 sec., Power (P) = 160W 160 = (40xh)/20 h = 80 meter

Explanations:

Let assume that girl climbs to the h meter. Then, power = potential energy (work)/time P = (mgh)/t Here, weight (mg) = 40N,t = 20 sec., Power (P) = 160W 160 = (40xh)/20 h = 80 meter