Question

find the pressure if the force of 2N is applied over the area of 2km²​

Answer 1

Answer:

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}}⟼Retardation(a)=−5m/s

2

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

\longmapsto\tt{Time\:Taken=10\:sec}⟼TimeTaken=10sec

Using 1st Equation :

\longmapsto\tt\boxed{v=u+at}⟼

v=u+at

Putting Values :

\longmapsto\tt{0=u+(-5)\times{10}}⟼0=u+(−5)×10

\longmapsto\tt{-u=-50}⟼−u=−50

\longmapsto\tt\bf{u=50\:m/s}⟼u=50m/s

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

Option c) 50 m/s is Correct .

_______________________

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

_______________________

Answer 2

Explanation:

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