Question

A body of mass 20 kg when applied a force of 100N , moved a distance of 50m and acquires a velocity of 8m/s. Find friction force

Answer 1

Explanation:

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Answer 2

Given :

• Mass of a body = 20 kg.
• Force = 100 N.
• Distance = 50m.
• Velocity = 8 m/s.

To find :

• Friction = ?

Solution :

To find the friction = ?

◈ First, we have to find the acceleration of the object.

◈ To find the acceleration of the object, we will use the equation of motion.

V² = u² + 2as.

Put the values in the formula.

➡ a = v²/2s

➡ a = 8×8/2×50

➡ a = 16/25 m/s².

∴ Acceleration of the object is 16/25 m/s².

Now,

To find the frictional force = ?

We will use the formula,

Fnet = ma

➡ 100 - f = 20 × 16/25

➡ 100 - f = 64/5

➡ f = 500-64/5

➡ f = 436/5

➡ f = 87.5 N.

Hence :

• The friction force is 87.5 Newton.
• The friction force is 87.5 Newton.The acceleration of the object is 16/25 m/s².