Question

A block of mass 100 gm slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, the thermal energy developed in the process is

Answer 1

According to energy conservation,

Change in kinetic energy appears in the form of heat that is thermal energy.Now,

Thermal energy= 1/2m(v²₁ - v²₂)

(since, W (Joule) = Q (Joule))

=1/2(100×10⁻³) (10²-5²)

=3.75J

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