The energy required to increase the speed of a certain car from 19 m/s to 23...

Question

Question

The energy required to increase the speed of a certain car from 19 m/s to 23 m/s is 185 kJ.

What is the mass of the car?

At what speed is the car’s kinetic energy equal to 185 kJ?

Answer 1

Answer #1

The mass will be

2E 2×185×103 f-U232-19 2202.38kg m=

The velocity will be

$v = \sqrt{\frac{2E}{m}} = \sqrt{\frac{2\times185\times10^3}{2202.38}} = 12.96ms^{-1}$

Answer 2

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