Question

36. A car retards uniformly at the rate of 5 m/s2 and stops in 10 s. The initial velocity of car is (a) 10 m/s (b) 5 m/s (c)50 m/s (d) 25 m/s​

Answer 1

Given :

• A car retards uniformly at the rate of 5 m/s² and stops in 10 s.

To Find :

• Initial Velocity of the car .

Solution :

$\longmapsto\tt{Retardation\:(a)=-5\:{m/s}^{2}}$

$\longmapsto\tt{Final\:Velocity(v)=0\:m/s}$

$\longmapsto\tt{Time\:Taken=10\:sec}$

Using 1st Equation :

$\longmapsto\tt\boxed{v=u+at}$

Putting Values :

$\longmapsto\tt{0=u+(-5)\times{10}}$

$\longmapsto\tt{-u=-50}$

$\longmapsto\tt\bf{u=50\:m/s}$

So , The Initial Velocity of car is 50 m/s .

Option c) 50 m/s is Correct .

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Three Equations Of Motion :

• v = u + at
• s = ut + 1/2 at²
• v² - u² = 2as

Here :

• v = Final Velocity
• u = Initial Velocity
• t = Time Taken
• a = Acceleration
• s = Distance Travelled

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Answer 2

Here ,

v= u+at

-u=-50

cancel negative sign from both sides

u=50

we get initial velocity 50 m/s

Be Brainly :)