Question

A 1,000 kg ball traveling at 5 m/s would have kinetic energy. A 10 kg ball traveling at 5 m/s would have kinetic energy. A 100 kg person falling at 5 m/s would have kinetic energy.

Answer 1

Question : 1

• mass (m) = 1000 kg
• velocity (v) = 5 m/s

=》

$k.e = \dfrac{1}{2}mv {}^{2}$

=》

$k.e = \dfrac{1}{2} \times 1000 \times (5) {}^{2}$

=》

$k.e = 500 \times 25$

=》

$k.e = 12500 \: joules$

kinetic energy = 12500 joules

Question : 2

• mass (m) = 10 kg
• velocity (v) = 5 m/s

=》

$k.e = \dfrac{1}{2} mv {}^{2}$

=》

$k.e = \dfrac{1}{2} \times 10 \times ({5})^{2}$

=》

$k.e = 5 \times 25$

=》

$k.e = 125 \: joules$

kinetic energy = 125 joules

Question : 3

• mass = 100 kg
• velocity = 5 m/s

=》

$k.e = \dfrac{1}{2} mv {}^{2}$

=》

$k.e = \frac{1}{2} \times 100 \times (5) {}^{2}$

=》

$k.e = 50 \times 25$

=》

$k.e = 1250 \: joules$

kinetic energy = 1250 joules