A Child Throws a Ball with an Initial Speed of 8.0

question 97

Short Answer

A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the
horizontal. The ball leaves her hand 1.0 m above the ground and experiences no
appreciable air resistance as it moves.
(a) How far from where the child is standing does the ball hit the ground?
(b) How long is the ball in flight before it hits the ground?
(c) What is the magnitude of the ball's velocity just before it hits the ground?

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Definitions:

Observed Score

The score actually obtained by an individual on a test or measurement.

True Score

The true score in psychometrics is an estimate of an individual's actual ability or trait level, free from measurement error.

Error Score

The difference between an observed value and the true value in data collections or experiments, indicating the amount of error in measurements.

Real Score

The actual measurement or true value that reflects the characteristic or ability being assessed, without error.