Question

A car is travelling at 20kmph, it speeds up to 60kmph in 6 seconds.
What is its ACCELERATION!!?​

Answer 1

Hi,

Here first we have to convert velocities in m/s

Given: Initial velocity = 20km/hr = 5.56m/s

Final velocity = 60 km/hr = 16.67m/s

Time = 6sec

using v=u+at

we get

16.67=5.56+a*6

after solving,a=1.85m/s2(ans.)

Hope this helps,

Good luck.

Answer 2

$\huge{\bf{\star{SOLUTION}}}$

KNOWN TERMS:-

u = intial velocity

v = final velocity

t = time

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GIVEN:-

$u = 20kmph = \frac{20 \times 1000}{3600} = \frac{50}{9} {ms}^{ - 1}$

$v = 60kmph = \frac{60 \times 1000}{3600} = \frac{50}{3} {ms}^{ - 1}$

$t = 6s$

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Acceleration of a body is the change in it's velocity.

FORMULA

$\boxed{\red{Acceleration={\frac{v-u}{t}}}}$

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Using the formula , we get,

$a = \frac{ \frac{50}{3} - \frac{50}{9} }{6}$

$a = \frac{ \frac{50}{3} \times \frac{3}{3} - \frac{50}{9} }{6}$

$a = \frac{ \frac{150 - 50}{9} }{6}$

$a = \frac{ \frac{100}{9} }{6}$

$a = \frac{100}{9 \times 6}$

$a = \frac{100}{54}$

a = 1.851 ${ms^{-2}}$

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$<marquee> Acceleration = 1.851ms-2 </marquee>$