Answers Physics I PretestQuestion 7

7

lesson pretestMultiple Choice

Pretest

Question 7 • Physics I

Which formula can be used to find velocity if kinetic energy and mass are known?

Answer

A

v is equal to square root of 1 half cap k cap e m end root

B

v is equal to square root of 2 m over cap k cap e end root

C

v is equal to square root of the fraction with numerator 2 cap k cap e and denominator m end root

D

v is equal to square root of cap k cap e m end root

Explanation

Kinetic energy is given by KE = ½mv². Solving for velocity gives v² = 2KE/m, so v = √(2KE/m). This matches choice C, the square root of 2 times kinetic energy divided by mass.

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