When ring, disc, hollow sphere and solid sphere roll down an identical inclined plane, then the time taken to reach bottom follows:

${\mathrm{t}}_{\text{solid sphere }}>{\mathrm{t}}_{\text{disc }}>{\mathrm{t}}_{\text{hollow sphere }}>{\mathrm{t}}_{\text{ring }}$

${\mathrm{t}}_{\text{solid sphere }}<{\mathrm{t}}_{\text{disc }}<{\mathrm{t}}_{\text{hollow sphere }}<{\mathbf{t}}_{\text{ring }}$

${\mathrm{t}}_{\text{solid sphere }}={\mathrm{t}}_{\text{disc }}<{\mathrm{t}}_{\text{hollow sphere }}={\mathrm{t}}_{\text{ring }}$

All objects will take same time.