BackClose

Select a Subject

Subject Test Physics

Question 19 of 36

beginning of content:
Tags:
SAT Subject Test

An object with mass m and speed v subscript 0 end subscript directed to the right strikes a wall and rebounds with speed v subscript 0 end subscript directed to the left.

The change in the object's kinetic energy is

Select an Answer

negative m text    end text v subscript 0 squared

Correct Answer: 
No

negative 1 half m invisible times text   end text v subscript 0 squared

Correct Answer: 
No

text Zero end text

Correct Answer: 
Yes

1 half m invisible times text   end text v subscript 0 squared

Correct Answer: 
No

m invisible times text   end text v subscript 0 squared

Correct Answer: 
No

The correct answer is zero. The kinetic energy of an object of mass m moving at speed v is fraction numerator 1 over denominator 2 end fraction m invisible times v to the power of 2 end exponent. Since the object has the same speed before and after striking the wall, its kinetic energy does not change.

Question Difficulty: 
medium