A 1.9 kg otter starts from rest at the top of a

muddy incline 90 cm long and slides down to
the bottom in 0.50 s.
What net external force acts on the otter
along the incline?
How do I do this?

d = 0.5at^2 = 0.90m,

0.5a(0.5)^2 = 0.90,
0.125a = 0.90,
a = 0.90 / 0.125 = 7.2m/s^2.

F = ma = 1.9 * 7.2 = 13.7N.

To find the net external force acting on the otter along the incline, we can use Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and acceleration.

Step 1: Find the acceleration of the otter.
Given:
- The distance traveled by the otter on the incline is 90 cm = 0.9 m.
- The time taken by the otter to slide down the incline is 0.50 s.

Acceleration (a) = (Change in Velocity) / (Time)
Since the otter starts from rest, the initial velocity is zero.
Velocity (v) = (Final Distance) / (Time)
v = 0.9 m / 0.50 s
Calculate v to get the final velocity.

Step 2: Find the net external force.
Given:
- The mass of the otter is 1.9 kg.

Net External Force (F) = mass (m) x acceleration (a)
Substitute the values of mass (m) and acceleration (a) to calculate the net external force on the otter.

So by following these steps, you can find the net external force acting on the otter along the incline.