a baseball is hit with a bat. the direction of the ball is completely reversed and its speed is doubled. if the actual contact with the bat lasts what is the ratio of the acceleration to the original velocity?

ratio = 9.67

Explanation:

given,

initial velocity = v

final velocity  = - 2 v

change in velocity = v-(-2v)

                               = 3 v

assuming the time be t = 0.31 s

acceleration =

                     =

                     = 9.67 v

ratio =

ratio = 9.67

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.