Question

a particle of mass 80 g is moving with a speed of 40ms due to some resistance its velocity is reduced to 10ms find the work done by the resistance​

Answer 1

Answer:

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Answer 2

Answer:-60 Joules

Explanation:We can easily calculate the workdone if only the change in velocity is given by using the work energy theorem: It states that change in kinetic energy (∆k) is equal to the work done by all the forces. Since in the given question only resistant force exists.

We can write: ∆k = Work done by resistance.

1/2(mv²) - 1/2(mu²)

by substituing

m= 8 × 10^-3

u= 40m/s

v= 10m/s

u can get the answer