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k0ka [10]
3 years ago
11

An object falls 210 m in 6.3 s. What was it's initial velocity? Express your answer with the correct number of significant digit

s.
Physics
1 answer:
KIM [24]3 years ago
8 0

Answer:

u = 2.5 \ m/s

Explanation:

Given data:

Height, h = 210 \ m

Time, t = 6.3 \ s

Let the initial velocity of the object be <em>u</em>.

From the kinematic equation,

h = ut + \frac{1}{2}gt^{2}

210 = u \times 6.3 + 0.5 \times 9.80 \times (6.3)^{2}

\Rightarrow \ u = 2.46 \ m/s

u = 2.5 \ m/s (rounding to tenth place)

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