Question

a ball freely falling at 20 m/s will in the next second have a speed of
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20 m/s
more than 30 m/s
30 m/s
10 m/s

Explanation:

Step1: Identify the acceleration formula

For free - fall, $v = v_0+gt$, where $v_0$ is the initial velocity, $g$ is the acceleration due to gravity ($g = 10m/s^{2}$ approximately near the Earth's surface), and $t$ is the time interval.

Step2: Substitute the values

Given $v_0 = 20m/s$, $g = 10m/s^{2}$, and $t = 1s$. Then $v=20 + 10\times1$.

Step3: Calculate the final velocity

$v=20 + 10=30m/s$.

Answer:

30 m/s