Which kind of energy does a bowling ball transfer to bowling pins?

kinetic energy

Explanation:

Kinetic energy is the form of energy related to the motion of an object. The kinetic energy of an object is given by:

where m is the mass of the object and v its speed. Therefore, any object in motion has kinetic energy: in this case, the bowling ball is in motion before the collision, so during the collision it transfers its kinetic energy to the pins.

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when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.