A) \[{{a}_{r}}=0\] and \[{{a}_{t}}=0\]
B) \[{{a}_{r}}=0\] but \[{{a}_{t}}\ne 0\]
C) \[{{a}_{r}}\ne 0\] but \[{{a}_{t}}=0\]
D) \[{{a}_{r}}\ne 0\] and \[{{a}_{t}}\ne 0\]
Correct Answer: C
Solution :
[a] If \[{{a}_{r}}=0\] and \[{{a}_{t}}=0\] then motion is uniform translatory [b] If \[{{a}_{r}}=0\] but \[{{a}_{t}}\ne 0\], then motion is accelerated translatory [c] If \[{{a}_{r}}\ne 0\] but \[{{a}_{t}}=0,\] then motion is a uniform circular [d] If \[{{a}_{r}}\ne 0\] and \[{{a}_{t}}\ne 0\] then motion is a non-uniform circular
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