What is the kinetic energy of an object with a mass of $2 k g$ $2 kg$ that has been in freefall for $5 s$ $5 s$ ?

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What is the kinetic energy of an object with a mass of $2 k g$ $2 kg$ that has been in freefall for $5 s$ $5 s$ ?

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Answer 1 · 2018-04-09T03:44:07

2401 Joules, approx 2.4kJ

Explanation:

Assuming $g = 9.8 m$ $g=9.8m$ / $s^{2}$ $s^2$ , initial velocity is zero and NO air resistance.

Use equation $d = V_{i} \cdot t + \frac{1}{2} a t^{2}$ $d=V_i*t+1/2at^2$ to find distance:
$d = 4.9 \cdot (5^{2})$ $d=4.9*(5^2)$
$d = 122.5 m$ $d=122.5m$

Now gravitational potential energy:

$E_{g} = m g h$ $E_g=mgh$
$E_{g} = 2 k g \cdot 9.8 m \cdot s^{- 2} \cdot 122.5 m$ $E_g=2kg*9.8m*s^-2*122.5m$
$E_{g} = 2401 J$ $E_g=2401J$

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What is the kinetic energy of an object with a mass of $2 k g$ $2 kg$ that has been in freefall for $5 s$ $5 s$ ?

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What is the kinetic energy of an object with a mass of 2kg2 kg that has been in freefall for 5s5 s?

1 Answer

Explanation:

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What is the kinetic energy of an object with a mass of $2 k g$ $2 kg$ that has been in freefall for $5 s$ $5 s$ ?