Question

A particle moves along the x-axis according to x(t)=10t-2t 2 m. (a)
What is the instantaneous velocity at t = 2 s and t=3 s? (b) What is the
instantaneous speed at these times? (c) What is the average velocity between
t=2 s and t=3 s?


1)<v>(2)=6 m∙s -1 ,<v>(3)=6 m∙s -1 ,v(2)=2,5 m∙s -1 ;v(3)=-2,5 m∙s -1 ;<v>(2-3)=1 m∙s -1 ;
2)<v>(2)=4 m∙s -1 , <v>(3)=4 m∙s -1 , v(2)=4 m∙s -1 ; v(3)= -4 m∙s -1 ; <v>(2-3)=1 m∙s -1 ;
3)<v>(2)=6 m∙s -1 ,<v>(3)=4 m∙s -1 , v(2)=2 m∙s -1 ; v(3)=-2 m∙s -1 ; <v>(2-3)=0 m∙s -1 ;
4)<v>(2)=4 m∙s -1 , <v>(3)=6 m∙s -1 , v(2)=2 m∙s -1 ; v(3)= - 2 m∙s -1 ; <v>(2-3)=1 m∙s -1

Answer 1

Answer:

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Explanation:

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