The Position of a Particle Moving Along the Y Axis

question 8

Multiple Choice

The position of a particle moving along the y axis has a position given by $y = 0.20 \mathrm {~m} + \left( 8.0 \frac { \mathrm { m } } { \mathrm { s } } \right) t - \left( 10 \frac { \mathrm { m } } { \mathrm { s } ^ { 2 } } \right) t ^ { 2 }$ Is there any time interval during which the particle is not moving?

• A)Yes,from 0.60 s to 1.00 s.
• B)Yes,from 0.795 s to 0.805 s.
• C)Yes,at the time t = 0.80 s.
• D)No,the velocity is never zero.
• E)No,an instant is not the same as a time interval.

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