Question

A ball is projected with horizontal velocity $v_o=\sqrt{9gR}$ at the bottom most point attached with inextensible string of length R and fixed at O as shown. Tension in the string in horizontal position

• A. 3 mg
• B. 5 mg
• C. 7 mg
• D. 9 mg

Answer 1

The correct option is C 7 mg

$v^2=v_0^2-2gR(1-cos\theta )v^2=7gR+2gRcos\theta T-mgcos\theta =\frac{m{v}^2}{R}T=7mg+3mgcos\theta v_h=\sqrt{7gr}\Rightarrow T=7mg$