A) 1 m/s, 3.5 m/s
B) 1 m/s, 3 m/s
C) 2 m/s, 4 m/s
D) 1.5 m/s, 3 m/s
Correct Answer: B
Solution :
\[\text{v=-6m}{{\text{s}}^{-1}}\] 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\[\text{=}\frac{9}{3}=3m{{s}^{-1}}\]You need to login to perform this action.
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