Question

A ball of mass 10 gram moving with a speed of 72 km per hour is hit by a bat that changes its speed to 144 km per hour find the change in the kinetic energy of the ball.
solve it with explanation​

Answer 1

Answer:

6 J

Explanation:

As we know, the kinetic energy of an object is given by,

K = $\frac{1}{2} mv^{2}$

Converting mass of the ball and velocities to SI units,

m = 0.01 Kg

Vi (initial velocity) = 20 m/s

Vf (final velocity) = 40 m/s

Therefore,

Ki (initial kinetic energy) = 2 J

Kf (final kinetic energy) = 8 J

The required expression,

Change in K = Kf - Ki

                     = 6 J

Answer 2

Answer:

6 j

Explanation:

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