Please answer ASAP. A 25.0 kg dog decides to go for a solo hike to the top of a 850.0 m tall mountain. 1. How much work does the dog do? 2. If the dog walks along the trail and covers a distance of 2550 m, what is the average force exerted by the dog? 3. Imagine there is a second dog with the same mass that decides to walk the trail but takes an alternative route that zigzags back and forth (its a much easier walk). Which dog does more work?

Four objects are being tested to see how they are affected by fluid friction. object w has a surface area of 4.5 cm2, object x has a surface area of 2.5 cm2, object y has a surface area of 6.2 cm2, and object z has a surface area of 3 cm2. which object would experience the most fluid friction?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?