The speed of a 1000-kg car whose KE is 450 kJ is
A) 21 m/s.
B) 30 m/s.
C) 45 m/s.
D) 900 m/s.

Name: The speed of a 1000-kg car whose KE is 450 kJ is A) 21 m/s. B) 30 m/s. C) 45 m/s. D) 900 m/s.
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Question

Quizplus · Accepted Answer

The formula for Kinetic Energy is KE = 1/2mv^2, where m is the mass of the object and v is its velocity. Rearranging this formula to solve for velocity, we get v = sqrt(2KE/m). Plugging in the values given, we get v = sqrt((2*450,000)/1000) = 30 m/s. Therefore, the correct answer is B.

The Speed of a 1000-Kg Car Whose KE Is 450