Question

A car travelling in a strainght line has a velocity of 5.0ms at some instant. After 4.0s,its velocity is 8.0ms. What is its average acceleration in thin time insterval?

Answer 1

$\huge\underline\blue{\rm Solution:}$

$\large\underline\purple{\rm Given: }$

★Initial Velocity (u) = 5m/s

★Final Velocity (v) = 8m/s

★Time (t) = 4 sec

$\large\underline\purple{\rm To\:Find: }$

★Average Acceleration $\rm{a_{avg}=?}$

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We know ,

$\large{\boxed{\rm a_{avg}={\frac{v-u}{t}}}}$

$\large\implies{\rm {\frac{8-5}{4}}}$

$\large\implies{\rm {\frac{3}{4}}}$

$\large\implies{\rm a_{avg}=0.75m/s^2}$

$\red{\boxed{\sf Averge\: Acceleration (a_{avg})=0.75m/s^2}}$

Answer 2

Explanation:

initial velocity 8m/s

final velocity 5m/s

time interval 4 s

average acceleration (8-5)/4= .75ms^-3