ACCELERATION \[a=\frac{6-0}{1}=6m{{s}^{-2}}\] For \[t=0\] to \[t=1\]s, \[{{S}_{1}}=\frac{1}{2}\times 6{{(1)}^{2}}=3m\] (i) For \[t=1\] s to \[t=2\] s, \[{{S}_{2}}=6.1-\frac{1}{2}\times 6{{(1)}^{2}}=3m\] (ii) For \[t=2s\] to \[t=3s\], \[{{S}_{3}}=0-\frac{1}{2}\times 6{{(1)}^{2}}=-3m\] (iii) Total DISPLACEMENT \[\text{S=}{{\text{S}}_{\text{1}}}\text{+}{{\text{S}}_{\text{2}}}\text{+}{{\text{S}}_{\text{3}}}\text{=3m}\] Average velocity\[\text{=}\frac{\text{3}}{\text{3}}\text{=1M}{{\text{s}}^{\text{-1}}}\] Total DISTANCE travelled \[\text{=9m}\] Average speed\[\text{=}\frac{9}{3}=3m{{s}^{-1}}\]

"> ACCELERATION \[a=\frac{6-0}{1}=6m{{s}^{-2}}\] For \[t=0\] to \[t=1\]s, \[{{S}_{1}}=\frac{1}{2}\times 6{{(1)}^{2}}=3m\] (i) For \[t=1\] s to \[t=2\] s, \[{{S}_{2}}=6.1-\frac{1}{2}\times 6{{(1)}^{2}}=3m\] (ii) For \[t=2s\] to \[t=3s\], \[{{S}_{3}}=0-\frac{1}{2}\times 6{{(1)}^{2}}=-3m\] (iii) Total DISPLACEMENT \[\text{S=}{{\text{S}}_{\text{1}}}\text{+}{{\text{S}}_{\text{2}}}\text{+}{{\text{S}}_{\text{3}}}\text{=3m}\] Average velocity\[\text{=}\frac{\text{3}}{\text{3}}\text{=1M}{{\text{s}}^{\text{-1}}}\] Total DISTANCE travelled \[\text{=9m}\] Average speed\[\text{=}\frac{9}{3}=3m{{s}^{-1}}\]

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A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field\[\overrightarrow{\text{E}}\]. Due to the force q\[\overrightarrow{\text{E}}\], its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively [NEET - 2018]

NEET Physics in NEET 10 months ago

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[b] \[\text{v=-6m}{{\text{s}}^{-1}}\] ACCELERATION \[a=\frac{6-0}{1}=6m{{s}^{-2}}\] For \[t=0\] to \[t=1\]s, \[{{S}_{1}}=\frac{1}{2}\times 6{{(1)}^{2}}=3m\] (i) For \[t=1\] s to \[t=2\] s, \[{{S}_{2}}=6.1-\frac{1}{2}\times 6{{(1)}^{2}}=3m\] (ii) For \[t=2s\] to \[t=3s\], \[{{S}_{3}}=0-\frac{1}{2}\times 6{{(1)}^{2}}=-3m\] (iii) Total DISPLACEMENT \[\text{S=}{{\text{S}}_{\text{1}}}\text{+}{{\text{S}}_{\text{2}}}\text{+}{{\text{S}}_{\text{3}}}\text{=3m}\] Average velocity\[\text{=}\frac{\text{3}}{\text{3}}\text{=1M}{{\text{s}}^{\text{-1}}}\] Total DISTANCE travelled \[\text{=9m}\] Average speed\[\text{=}\frac{9}{3}=3m{{s}^{-1}}\]

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