The speed of the ball at the given mass and kinetic energy is 7 m/s.
The given parameters;
- kinetic energy of the ball, K.E = 98 J
- mass of the ball, m = 4 kg
The speed of the ball is calculated as follows;
[tex]K.E = \frac{1}{2} mv^2[/tex]
where;
v is the speed of the ball
[tex]v = \sqrt{\frac{2K.E}{m} } \\\\v = \sqrt{\frac{2\times 98}{4} } \\\\v = 7 \ m/s[/tex]
Thus, the speed of the ball at the given mass and kinetic energy is 7 m/s.
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