A student is investigating gravity and falling objects. She drops three balls and times how long it takes each ball to hit the g
round. What is the most likely source of error?
(1 point)
She used balls that are different sizes.
She did not measure the circumference of the balls.
She dropped the balls from different heights.
She did not measure the mass after the balls hit the ground.
(1 point)
She used balls that are different sizes.
She did not measure the circumference of the balls.
She dropped the balls from different heights.
She did not measure the mass after the balls hit the ground.
2 answers:
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Answer:
3.467 s
Explanation:
given,
distance , d = 49 mm = 0.049 m
initial speed of the of the rock, v = 17 m/s
time taken by the Heather rock to reach water
using equation of motion
taking downward as negative
4.9 t² + 17 t - 0.049 = 0
now,
t₁ = -3.47 s , 0.0028 s
rejecting negative values
t₁ = 0.0028 s
now, time taken by the ball of Jerry
using equation of motion
taking downward as negative
4.9 t² - 17 t - 0.049 = 0
now,
t₂ = 3.47 s ,-0.0028 s
rejecting negative values
t₂ = 3.47 s
now, time elapsed is = t₂ - t₁ = 3.47 - 0.0028 = 3.467 s