Question

A 100 kg block is kept at the back of a truck moving with an acceleration of
2 m/s2. There is no relative motion. What is the work done by frictional force on the block as truck is displaced by 2 m w.r.t ground.

[Ans. +400J ]

Plzzzz give full explanation... and I'll mark you as brainleist
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Answer 1

Answer:

see the photo hope you will be able to understand.

First draw the free body diagrams(FBD) and then solve the forces and acceleration.

Answer 2

The work done by frictional force on the block as truck is displaced by 2 m is 400 J.

Explanation:

It is given that,

Mass of the block, m = 100 kg

Acceleration of the block, $a=2\ m/s^2$

We need to find the work done by frictional force on the block as truck is displaced by 2 m w.r.t ground. We know that the product of force and displacement is called work done by an object. It is given by :

$W=F\times d$

$W=m\times a \times d$

$W=100\ kg\times 2\ m/s^2\times 2\ m$

W = 400 J

So, the work done by frictional force on the block as truck is displaced by 2 m is 400 J. Hence, this is the required solution.

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