Chameleons catch insects with their tongues, which they can rapidly extend to great lengths. In a typical strike, the chameleon's tongue accelerates at a remarkable 280 m/s^2 for 20 ms, then travels at constant speed for another 30 ms.

During this total time of 50 ms 1/20 of a second, how far does the tongue reach?

Express your answer to two significant figures and include the appropriate units.

0.224 m

Explanation:

The motion of the first 20 ms is a uniformly accelerated motion. With an initial velocity of 0 m/s, the equation of motion used is

where is the distance, is the initial velocity, is the acceleration and is the time.

The velocity, , at the end of this part of the motion is

.

This velocity is maintained for 30 ms through a distance of

The total distance is 0.056 + 0.168 = 0.224 m

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

d.7.5cm is your answer