The position of a particle moving along the x-axis with a constant acceleration may be determined from the expression x(t)=bt+ct2, where b = 2.00 m/s, c=7.50 m/s2, and x will be in meters when t is in seconds.
Determine the following.
(a) the average velocity of the particle over the time interval
t=(1→3) s.
(b) the instantaneous velocity of the particle at t = 2 s, the midpoint of the above time interval. (Indicate the direction with the sign of your answer.)

Apoint charge +q is at the origin. a spherical gaussian surface centered at the origin encloses +q. so does a cubical surface centered at the origin and with edges parallel to the axes. select "true" or "false" for each statement below. the electric flux through the spherical surface is greater than that through the cubical surface. suppose (for this statement only), that q is moved from the origin but is still within both the surfaces. the flux through both surfaces remains unchanged. the area vector and the e-field vector point in the same direction for all points on the spherical surface. the e-field at all points on the spherical surface is equal due to spherical symmetry. the flux through the spherical gaussian surface is independent of its radius.