A stone is thrown vertically upward with initial speed

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A stone is thrown vertically upward with initial speed 30 m/s30\,\text{m/s}. Taking upward as positive and g=9.8 m/s2g=9.8\,\text{m/s}^2, its velocity after 4 s4\,\text{s} is closest to (a) +9.2 m/s+9.2\,\text{m/s} (b) +69.2 m/s+69.2\,\text{m/s} (c) −9.2 m/s-9.2\,\text{m/s} (d) −49.2 m/s-49.2\,\text{m/s}

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