Question

A disk having plane parallel to the horizontal in moving such that velocity of point P w.r.t ground is $2\widehat{j}$ m/s as shown in figure. If radius of disk is R = 1 m and the angular speed of disk about vertical axis passing through disk is w = 2rad/sec, the velocity of centre of disc in m/s is –

• A. $2\widehat{j}$
• B. $2\widehat{i} + 2\widehat{j}$
• C. –$2\widehat{i} + 2\widehat{j}$
• D. None

Answer 1

Answer: (C)

–$2\widehat{i} + 2\widehat{j}$

Answer 2

${\overset{\rightarrow}{V}}_{CG} = {\overset{\rightarrow}{V}}_{CP} + {\overset{\rightarrow}{V}}_{PG}$ = $–2\widehat{i} + 2\widehat{j}$ m/s