High School

A person rolls a 7 kg bowling ball down a lane in a bowling alley. The lane is 18 m long. The ball is traveling at 7 m/s when it leaves the person's hand. What is the ball's kinetic energy at this point?

A) 25 J
B) 172 J
C) 343 J
D) 19 J

Answer :

Answer:

172 J.

Explanation:

The kinetic energy of an object is given by the formula:

KE = 0.5 * m * v^2

Where:

KE is the kinetic energy

m is the mass of the object

v is the velocity of the object

In this case, the mass of the bowling ball is 7 kg, and its velocity is 7 m/s. Plugging these values into the formula:

KE = 0.5 * 7 kg * (7 m/s)^2

KE = 0.5 * 7 kg * 49 m^2/s^2

KE = 171.5 J

Rounded to the nearest whole number, the kinetic energy of the ball is approximately 172 J. So, the answer is B) 172 J.