The function shown below gives the position of a particle at time t. http://www.webassign.net/userimages/2.5.020.jpg?db=v4net&id=53223

At what labeled points is the velocity of the particle increasing? (Select all that apply.)

Question

The function shown below gives the position of a particle at time t. http://www.webassign.net/userimages/2.5.020.jpg?db=v4net&id=53223

At what labeled points is the velocity of the particle increasing? (Select all that apply.)

anonymous · Answer

i know that if f(x) is concave up f'(x) is increasing, i tried t1 t2 but i got it wrong also tried just t2 and got it wrong and i also tried "none of these and got it wrong.

anonymous · Answer

so is the answer for c) is t1, t2 and t5 or t2 and t5? can someone please explain it please