As shownbelow AB represents an infinite wall tangential to a horizontal semi-circular track. O is a point source of light on the ground at the centre of the circle. A block moves along the circular track with a speed v starting from the point where the wall touches the circle. If the velocity and acceleration of shadow along the length of the wall is respectively V and a, then :

As shownbelow AB represents an infinite wall tangential to a horizonta

1.	As shownbelow AB represents an infinite wall tangential to a horizontal semi-circular track. O is a point source of light on the ground at the centre of the circle. A block moves along the circular track with a speed v starting from the point where the wall touches the circle. If the velocity and acceleration of shadow along the length of the wall is respectively V and a, then :
Answer» `V=vcos((vt)/(R))` `V=v sec^(2)((vt)/(R))` `a=((v^(2))/(R))sec^(2)((vt)/(R))TAN((vt)/(R))` `a=((2V^(2))/(R))sec^(2)((vt)/(R))tan((vt)/(R))` ANSWER :b,d