From a set of graphed data the slope of the best fit line is found to be 1.35 m/s and the slope of the worst fit line is 1.29m/s. determine the uncertainty for the slope of the line.

Solution:

Let the slope of the best fit line be represented by ''

and the slope of the worst fit line be represented by ''

Given that:

= 1.35 m/s

= 1.29 m/s

Then the uncertainity in the slope of the line is given by the formula:

              (1)

Substituting values in eqn (1), we get

= 0.03 m/s

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.