Question

A 4kg object is at rest. How much force is required to get the object to a velocity of 20m/s in 2 seconds? (Show work and include units)​

Answer 1

SOLUTION :

The Object was at rest. So, Initial Velocity is Zero.

• [Initial Velocity]u = 0
• [Final Velocity]v = 20 m/s
• [Time]t = 2 seconds
• Mass = 4kg
• Force = ?

We know that :

$\sf{Force = Mass \times \dfrac{(v-u)}{t}}$

Applying it, we get:-

$\sf{Force = 4 \times \dfrac{(20-0)}{2}}$

$\sf{Force = 2 \times \dfrac{(20)}{2}}$

$\sf{Force = 2 \times 10}$

$\sf{Force = 20 \ N \ (Newton)}$

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Thus 20N of force is required.

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