Question

यदि एक पत्थर को किसी मकान की छत से मुक्त रूप से गिरते हुए जमीन तक पहुँचने में 4 सेकंड का समय लगता है,तो मकान की ऊँचाई होगी लगभग
(क)20 m
(ख)160 m
(ग)80m
(घ)40m

Answer 1

Answer:

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Answer 2

(C)The height of the building is 80 m.

Explanation:

To calculate the height of the building, use second equation of motion.

$s=ut+\frac{1}{2}gt^2$

Here s is the height, u is the initial velocity and t is time taken to reach the ground.

Given t = 4 s, and initial velocity, u = 0 because stone dropped from building and take g = 10 m/s^2.

Substitute the given values, we get

$s=0\times t+\frac{1}{2}\times 10m/s^2(4s)^2$

$s=80m$.

Thus, the height of the building is 80 m.

#Learn More:

Topic: Equation of motion.

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