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Answer :
Given:
m = 0.32 kg
v = 11.5 m/s
To find:
1) Kinetic energy = ?
2) Work needed to stop the ball = ?
Formula used:
1) Kinetic energy = [tex] \frac{1}{2} m v^{2} [/tex]
2) Work = kinetic energy
Solution:
1)
Kinetic energy is given by,
Kinetic energy = [tex] \frac{1}{2} m v^{2} [/tex]
K.E. = [tex] \frac{1}{2} 0.32 \times 11.5 \times 11.5 [/tex]
K.E. = 21.16 Joule
Thus, option (d) is the correct answer.
2)
Work needed to stop the ball is same as the kinetic energy because energy is the capacity to do work. Since, work is opposing the movement of the ball. Thus, Work = - Kinetic energy
Work = -21.16 Joule
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