Question

A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take
g=10ms−2

Answer 1

Answer on Question #51934, Physics, Mechanics | Kinematics | Dynamics

Given:

$$t = 4s \quad \alpha = 90{}^{\circ} \quad g = 10^m/s^2$$

Find: $v$

Solution:

$$v = \frac{gt}{2\sin\alpha} = \frac{gt}{2} = \frac{10 \cdot 4}{2} \text{m/s} = 20 \text{m/s}$$

Answer: $v = 20 \text{m/s}$

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