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Explanation:
1) v = dx/dt = 0 = tan0°
when there is tangent on curve it makes 0° with X axis.
after calculating the zero velocity occurs at 7 times.
2) V(at 6 s) = dx/dt = 0
3) No, As many times tan x = -ve [when,x > π/2]
4) yes,, V avg. is -ve as it have more tangent where tanx = -ve
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