Question

Heya mates. .

help me with this one. ☺️

Calculate the work done to make the velocity of a body ,of mass 20 kg , from 2 m/s to 5 m/s .

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Thanks ..

Answer 1

HERE IS YOUR ANSWER IN ATTACHMENT

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Answer 2

${\huge {\mathfrak {Answer :-}}}$

✨ $<b>Interesting question. </b>$ ✨

➡️ Here,

Initial velocity (u) = 2 m/s.

Final velocity (v) = 5 m/s.

$<b>Using the equations of motion, </b>$

➡️ v^2 = u^2 + 2as.

Or, (5)^2 = (2)^2 + 2as.

Or, 25 - 4 = 2as.

Or, as = 21/2 = 10.5 ......... (1)

➡️ Now, we have,

Work done = F * s

= ma * s [F = ma]

= 20 * 10.5 J

= 210 J.

✨ $<b>Therefore, the Work done is 210 Joules.</b>$ ✨

$<i>$ That's it..

${\red {Keep \: asking.. }}$ ✌️

${\huge {\blue {Thanks..}}}$