Question

An o object of 5 kg is moving in a straight line with a uniform speed of 10 metre per second the resultant force on the object is
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Answer 1

GIVEN :-

• Mass of object ( m ) = 5 kg.
• Initial velocity ( u ) = 10 m/s.
• Final velocity ( v ) = 10 m/s.

TO FIND :-

• The resultant Force ( F ).

SOLUTION :-

As we know that the formula for acceleration is given by,

$\\ : \implies \displaystyle \sf \:Acceleration = \dfrac{v - u}{t}$

$: \implies \displaystyle \sf \:Acceleration = \frac{10 \: - 10}{t}$

$: \implies \displaystyle \sf \:Acceleration = \frac{0}{ t}$

$: \implies \underline{ \boxed{\displaystyle \sf \:Acceleration =0 \: ms ^{ - 2} }}$

Now , On applying the formula of force we get,

$\\ : \implies \displaystyle \sf \:Force = mass \times Acceleration$

$: \implies \displaystyle \sf \:Force =5 \: kg \times 0 \: ms ^{ - 2}$

$: \implies \displaystyle \sf \:Force =0 \: kg.ms ^{ - 2}$

$: \implies \underline{ \boxed{ \displaystyle \sf \bold{ \:Force =0 \: Newton}}}$

Answer 2

Given : An  object of 5 kg is moving in a straight line with a uniform speed of 10 metre per second

To Find : the resultant force on the object

Solution:

mass = 5 kg

moving in a straight line with a uniform speed of 10 metre per second

Hence constant velocity of 10 m/s

acceleration   a= dv/dt

v = Velocity is constant

Hence a = 0

acceleration is rate of change of velocity,  as velocity is constant of rate of change of velocity is zero

so acceleration is zero

a = 0

m = 5 kg

F = ma

F = Force

F = 5 * 0  = 0

resultant force on the object is 0 N

or No force

Note : Air resistance / friction  is assumed zero here

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