Type your answer with numbers only, units are already included for you. Round to the tenths place.

Question

A triceratops (Sara), when running, has a velocity of 3.8 m/sec. After a short dash for 3.6 seconds, she makes impact with an ankylosaurus (Tank) with a force of 435 N. How much work did Sara accomplish running into Tank and what was the power of her attack?

Work = Joules

Power=  Watts 

Answer 1

The work can be found by the change in Kinetic Energy = 1/2 m (Δv)²

Two issues with this question.

Power can be found by finding the change in energy/time.

The time of impact is not given, only the time that Sara is running, which is not the time of impact.

That makes a difference for calculating power.

Significant figures. Just saying to round to the tenths may work for an online answer bank, but there are only 2 significant figures given in the data for two values, so the answer is not valid beyond two significant figures.

A third digit can be included as an indication of uncertainty, but it is not valid.