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Gravitation — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceGravitation3 Marks
Question
A ball thrown up vertically returns to the thrower after 6s. Find the maximum height it reaches.
✓

Answer

Let the maximum height attained by the ball be h.
Initial velocity during the upward journey, u = 29.4m s-1
Final velocity, v = 0
Acceleration due to gravity, g = -9.8m s-2
From the equation of motion, s = ut + 1/2 at2
h = 29.4 × 3 + 1/2 × -9.8 × (3)2 = 44.1m

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