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2015-03-24T00:05:39+05:30

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U = 15 m/s
g = -10 m/s²
t = 2s
h = ut + 0.5at²
⇒ h = 15×2 + 0.5×(-10)×2²
⇒ h = 30 - 0.5×10×4
⇒ h = 30 - 20
⇒ h = 10m

PE = mgh = 1.5×10×10 = 150J
1 5 1
thanks sir actually in 9 science cbse marking scheme it was written the ans as 750J
have you written the question fully?
was there anything like "the person was standing on the top of a building of height 40m"?
2015-03-24T00:16:00+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
H = ut + 1/2at²
 h = 15×2 + 0.5×(-10)×2²
= 30 - 0.5×10×4
= 10m

PE = 1.5×10×10 = 150J
PE=150J
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