Question

Plz help me guys........​

Answer 1

$\huge\bigstar\underline\mathfrak\pink{Answer:-}$

$\large\sf\red{Given:-}$

$\sf{mass\:of\:the\:car}$ = $\sf{1500\:kg}$

$\sf{initial\:velocity}$ = $\sf{30kmh}$

$\longrightarrow$$\sf\frac{30 \times 1000m}{60 \times 60s}$

$\longrightarrow$$\sf\frac{30}{3} ms$

$\sf{final\:velocity}$ = $\sf{60km\:h}$

$\longrightarrow$$\sf\frac{60 \times 1000m}{60 \times 60s}$

$\longrightarrow$$\sf\frac{50}{3} ms$

$\sf\green{Now,}$

$\sf{the\:initial\:kinetic\:energy\:of\:the\:car}$

$\sf{ek1}$ = $\sf\frac{1}{2}$ $\sf{mu}^{2}$

$\longrightarrow$$\sf\frac{1}{2} × 1500 × \frac{25}{3} × \frac{25}{3}$

$\longrightarrow$$\sf\frac{250×50}{3}$

$\longrightarrow$$\sf\frac{156250}{3}$j

$\sf\red{Similarly,}$

$\sf{Final\:kinetic\:energy\:of\:the\:car}$

$\sf{ek1}$ = $\sf\frac{1}{2}$ $\sf{mv}^{2}$

$\longrightarrow$$\sf\frac{1}{2} × 1500 × \frac{50}{3} × \frac{50}{3}$

$\longrightarrow$$\sf\frac{250×2500}{3}$

$\longrightarrow$$\sf\frac{625000}{3}$j

$\sf\orange{Thus,}$

$\sf{the\:work\:done=change\:in\:Kinetic\:energy}$

$\longrightarrow$$\sf{ekf-eki}$

$\longrightarrow$$\sf\frac{625000-156250}{3}$

$\longrightarrow$$\sf\frac{468750}{3}$

$\longrightarrow$$\sf{156250\:j}$

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