A 90 N student climbs up a set of stairs that is 8 meters high in 4 seconds. How much work does he do?

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

Could someone . i have tried to solve myself but my calculation is off

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest