Question

A stone hanging from a massless string of length 15 m is projected horizontally with speed 147 m/s. Then the speed of the particle at the point where tension in string equals the weight of particle is –

• A. 10 m/s
• B. 7 m/s
• C. 12 m/s
• D. None of these

Answer 1

Answer: (B)

7 m/s

Answer 2

T – mg cos q = $\frac{mv^{2}}{\mathcal{l}}$ and v² – u² = – 2gl (l – cos q)

also T = mg