A point mass has rectilinear motion. It is initially at rest atpoint zero, trave

Question

A point mass has rectilinear motion. It is initially at rest atpoint zero, travels to the 10.0 meter mark, and returns to itsstarting point. The total trip required 10.0 s. For thisinformation which of the following statements could be true? A) The average velocity for the 10.0 s interval cannot bezero. B) The instantaneous velocity is never zero, except at thestart. C) The time for the mass to reach the 10.0 m mark must be morethan 5.0 s if the average speed for the travel from 10.0 m to 0.0 mmark is 1.8 m/s. D) The mass' acceleration could be constant on the trip from10.0 m to 0.0 E) The mass' acceleration could be constant on the trip from0.0 m to 10.0
If anyone can explain the answer to me, that would be great. Iknow A can't be the answer. A) The average velocity for the 10.0 s interval cannot bezero. B) The instantaneous velocity is never zero, except at thestart. C) The time for the mass to reach the 10.0 m mark must be morethan 5.0 s if the average speed for the travel from 10.0 m to 0.0 mmark is 1.8 m/s. D) The mass' acceleration could be constant on the trip from10.0 m to 0.0 E) The mass' acceleration could be constant on the trip from0.0 m to 10.0
If anyone can explain the answer to me, that would be great. Iknow A can't be the answer.

Explanation / Answer

The statements B , C , D , E are true                          instantaneousvelocity = x /t    Average speed is more than 5s to get 1.8m/s time is 5.5s Average speed =10/x = 1.8m/s x = 5.5s    mass of acceleration could be constant

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