If An Object Is Released 19.6 Meter Above The Ground. How Long Does It Take The Object To Reach The Ground? (g = 9.8 M/sec²) - Testpoint

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If an object is released 19.6 meter above the ground. How long does it take the object to reach the ground? (g = 9.8 m/sec²)

2 seconds
8 seconds
10 seconds
None of these

Explanation

Step 1: Use the equation for free fall from rest

$s = \frac{1}{2} g t^{2}$

where $s = 19.6 m$ , $g = 9.8 {m/s}^{2}$ , $t = ?$ .

Step 2: Substitute values

$19.6 = \frac{1}{2} \times 9.8 \times t^{2}$ $19.6 = 4.9 \times t^{2}$

Step 3: Solve for $t^{2}$

$t^{2} = \frac{19.6}{4.9} = 4$ $t = 2 seconds$

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