A block of mass m = 2 kg slides down a frictionless incline of angle θ = 30° starting from rest — JEE Physics
A block of mass $m = 2$ kg slides down a frictionless incline of angle $\theta = 30°$ starting from rest. After traveling a distance $s = 5$ m along the incline, find the speed of the block.
1 Answer
VCVarun Choudhary
✓ Accepted
· 17d ago
▲ 4
Using Work-Energy theorem:
$$W_{net} = \Delta KE$$
$$mgs\sin\theta = \frac{1}{2}mv^2$$
$$v = \sqrt{2gs\sin\theta} = \sqrt{2 \times 10 \times 5 \times 0.5} = \sqrt{50} = 5\sqrt{2} m/s$$
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Discussion (5)
T
This is exactly the kind of step-by-step I needed. Respect.
S
Clean and to the point. Bookmarking this for revision.
M
Underrated solution. The way you set it up makes it almost obvious.
L
Brilliant explanation, the substitution step is what I kept missing.
VA
Great discussion here. If you want more practice on this concept, check the related questions in this category.