Aplane starts from rest and accelerates uniformly over a time of 20 seconds for a distance of 300 meters. determine the plane´s acceleration.

1.5 m/s2

Explanation:

U = 0 m/s ( from rest)

t = 20 s

S = 300 m

S = ut + 1/2 * a * t2

300 = 0 + 1/2 * a * 20*20

a = 1.5m /s2

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.