A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. If we neglect air, the magnitude of the acceleration of the ball while it is in flight is
A) 25 m/s2.
B) 18 m/s2.
C) 9.8 m/s2.
D) 8.5 m/s2.
E) 0 m/s2.
C
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Fill in the blank(s) with correct word
A ping-pong ball covered with a conducting graphite coating has a mass of 2.5 × 10^-3 kg and a charge of 4.0 µC. What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s2)
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