Question

a force applied to an object mass 400g changes it's velocity from 3ms-1 to 8ms-1 in 10 s . calculate the magnitude of force." I have asked this q 2times but no one have given Mee the correct answer.. so please give it correct."​

Answer 1

Working out:

In this question, we are provided with the mass, initial velocity, final velocity and the time taken. And, we are asked to find the force. But Why this is given?

Because,

$\large{ \boxed{ \bf{F = ma}}}$

Here, m = mass and a = acceleration

We can Acceleration by using the first equation of motion which says v = u + at, So let's calculate a !

Given,

• v = 8 m/s
• u = 3 m/s
• t = 10s

By using formula,

➝ v = u + at

➝ 8 = 3 + a(10)

➝ 5 = 10a

➝ a = 0.5 m/s²

Now, we have mass of the objects and it's acceleration, So let's find the force acting upon it by using the formula:

Given,

• Mass = 400 g = 0.4 kg

➝ F = ma

➝ F = 0.4 × 0.5 N

➝ F = 0.2 N

The force acting upon the body:

$\large{ \boxed{ \bf{ \red{F = 0.2 \: N}}}}$

And we are done !!

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Answer 2

Given :

• A force applied to an object mass 400g changes it's velocity from 3ms-1 to 8ms-1 in 10 s.

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Find :

• What is the force?

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Concept :

• As per the given question, we can find the answer by using "Force formula".

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Using formula :

★ Force = Mass × Acceleration.

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Calculations :

→ Mass = 8 - 3

→ Mass = 5/10

→ Mass = 0.5

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Applying formula :

→ Force = 0.4 × 0.5

→ Force = 0.2 N

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Therefore, 0.2 N is the required force.