A uniform disc of mass 0.5 kg and radius r is projected with velocity 18 m/s at t = 0 s on a rough horizontal surface. It starts off with a purely sliding motion at t = 0 s. After 2s it acquires a purely rolling motion (see figure), The total kinetic energy of the disc after 2s will be________J
(given, coefficient of friction is 0.3 and g=10m/s 2 ).
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(54)
V=18-3x2
V=12m/s
KE = 3x 18 = 54J
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