What is the acceleration of the cart at t=8 seconds? a) 0 m/s^2
b) 10 m/s^2
c) 20 m/s^3
d) -20m/s^2

Hi there!

The acceleration of an object is simply the instantaneous rate of change (slope) or derivative of its velocity function at a specific point in time.

At t = 8 sec, we can see that the velocity function is a horizontal line.

A horizontal line has a slope of 0, so the acceleration = A) 0 m/s².

**Not all graphs will be this easy! If trying to solve for acceleration for a line with a slope, the slope formula will need to be used, in that:

OR, if the acceleration varies:

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.