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If an object with a mass of #5 kg # changes speed from #5m/s# to #13 m/s#, by how much does its kinetic energy change?

Answer 1

Adrian Ayala

#"360 J"#

Kinetic energy is given by the formula

#"K" = 1/2\ "mv"^2#

Change in kinetic energy when there is change in velocity is

#"ΔK" = 1/2\ "m(v"^2 - "u"^2")"#

#"ΔK" = 1/2 × "5 kg" × [("13 m/s")^2 - ("5 m/s")^2] = "360 J"#

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Answer 2

Adrian Ayala

The change in kinetic energy is 360 joules.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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