Question

A body travelling in a speed of 15m/s and brought to rest in 90s. Find the acceleration and displacement​

Answer 1

Answer:

His displacement will be 1350 m

and acceleration would be 0 because the body is moving with constant speed

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Answer 2

$\fbox \purple{GIVEN:-}$

• Speed=15 m\s
• Time= 90 s

$\fbox \pink{to \: calculate}$

• Acceleration
• Displacement

$\fbox \green{solution}$

By the formula:

$\fbox \red{acc = v - u \ t }$

$= \frac{15 - 0}{9} \\ = \frac{15}{9} \\ = 1.6 \: m {s}^{2}$

$\fbox \orange{acc =1.6 \: ms2 }$

For calculating Displacement:

$\fbox \red{s = ut + 12 \: at2}$

$= (15)(9) + \frac{1}{2} (1.6)(9) {}^{2} \\ = (15)(9) + \frac{1}{2} (1.6)(81) \\ = 135 + \frac{1}{2} \times 1.6 \times 81 \\ = 135 + \frac{1}{2} \times \frac{8}{5} \times 81 \\ = 135 + \frac{1 \times 8}{2 \times 5} \times 81 \\ = 135 + \frac{8}{10} + 81 \\ = 135 + \frac{4}{5} \times 81 \\ = 135 + \frac{324}{5} \\ = \frac{675}{5} + \frac{324}{5} \\ = \frac{999}{5} \\ = 199.8$

$\fbox \orange{s = 199.8 \: m}$

$\huge\pink{ハンはジャクソンが大好き}$