Question

ou are sparring in a tae kwon do class. Your opponent executes a roundhouse kick. The average angular velocity of his kicking leg and foot is 20 rad/s. The angular displacement from his foot to your head is 5 rad. How much time do you have to move if you want to avoid being kicked in the head?

Answer 1

Answer:

0.25 s

Explanation:

The angular velocity, ω, is related to the angular displacement, θ, by

$\omega = \dfrac{\theta}{t}$

t is the time.

Making t subject of the formula,

$t = \dfrac{\theta}{\omega}$

Substituting values in the question,

$t = \dfrac{5}{20} = 0.25\text{ s}$