Question #288112

Jane is walking at such speed o that her kinetic energy is 20 J. What is her speed? It started to rain. Jane runs at a rate of 4.2 m/s. Find the change in her kinetic energy. Jane has a mass of 50 kg.

Expert's answer

The kinetic energy is given as follows:

Thus, the speed is:

In the second case:

Thus, the change in kinetic energy is:

**Answer. **0.89m/s, 421J.

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