Question

a car increases it's speed from 20km/hr to 50km/hr in10sec. what is its acceleration
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Answer 1

$\red\star\mathfrak\blue{\large{\underline{\underline{Solution:-}}}}$

$\mathfrak \red{u = 20 \: km / \: hr}$

$\mathfrak \purple{\implies} \mathfrak \red{u = 20 \times \frac{18}{5} }$

$\mathfrak \purple{ \implies } \mathfrak \red{u = 72 \: m/ s}$

$\mathfrak \purple{v = 50 \: km/ \: hr}$

$\mathfrak \red{\implies} \mathfrak \purple{v = 50 \times \frac{18}{5} }$

$\mathfrak \red{\implies} \mathfrak \purple{v = 180 \: m/s}$

$\mathfrak \green{t =10 \: s }$

$\purple\star\mathfrak\red{\large{\underline{\underline{As,\:we \:know\:the\: formula\:of\: acceleration\:we\:get:-}}}}$

$\mathfrak \pink{ \implies} \mathfrak \green{a = \frac{v - u}{t} }$

$\pink{\implies} \mathfrak \green{a = \frac{180 - 72}{10} }$

$\pink{ \implies} \mathfrak \green{a = \frac{108}{10} }$

$\pink{ \implies} \mathfrak \green{a = 10.8 \: m /s {}^{2} }$

Answer 2

Hope this will help u...