A small block of mass 10 g is projected along the smooth path from rest as shown in the given figure below. Find its speed at the point B.

Q: A small block of mass 10 g is projected along the smooth path from rest as shown in the given figure below. Find its speed at the point B.

Numerical

(a) 1 m/s

(b) 10 m/s

(c) 20 m/s

(d) None of these

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Ans: (b)
Sol: Applying Energy Conservation ,

$\displaystyle m g h = \frac{1}{2} m v^2$

$\displaystyle v^2 = 2 g h = 2 \times 10 \times 5 $

$\displaystyle v^2 = 100 $

v = 10 m/s