Question

an object moving with velocity 40 m/s change its velocity to 60 m/s the mass of the object. measures to be 4 kg. calculate the amount of work done. ​

Answer 1

$work \: done = \: change \: in \: kinetic \: energy \\ kinetic \: energy \: = \frac{1}{2} m \: ( {v}^{2} - {u}^{2}) \\ kinetic \: energy = \frac{1}{2} \times 4( {60}^{2} - {40}^{2} ) \\ work \: done = \frac{1}{2} \times 4 \times (3600 - 1600) \\ work \: done \: = \frac{1}{2} \times 4 \times 2000 \\ work \: done \: = 4000 \: joules$

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