Answer :
Final answer:
Final answer
The work done against friction is 98 J. Hence, the correct option is (b) 98 J.
Explanation:
To calculate the work done against friction, we need to know the force of friction, which is the product of the mass of the block, gravitational acceleration (g), and the coefficient of friction. The gravitational acceleration on Earth is approximately 9.8 m/s2. The force of friction (f) can be calculated using the formula f =
coefficient of friction (
0.2)
\times mass (50 kg)
\times g (9.8 m/s2). The work done (W) by this force over a horizontal distance of 1 m is then W = f
\times distance, which gives us 98 J. This is the energy required to overcome the force of friction while the block slides for 1 m.
