Correct Answer: Option C

Explanation

m=1200kg,  \(V_1\)= \(10ms^{-1}\)   \(V_2\) = \(15ms^{-1}\),  w= ?

work=►K.E = \( K.E_2\) =  \(K.E_2\) - \(K.E_1\)

⇒work= \(\frac{1}{2}{mv^2_2}-\frac{1}{2}{mv^2_1}\)

⇒work= \(\frac{1}{2}m({v^2_2}-{v^2_1}\))

⇒work= \(\frac{1}{2}× 1200× (15^2-10^2)\)

⇒work = 600 ×  (225 -100)

⇒work= 600 × 125

⇒work= 7.5×\(10^4 j\)

There is an explanation video available below.

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