A ball is thrown horizontally from the top of a 20-m high hill.It strikes the ground at an angle of 45°.With what speed was it thrown? Use g = 10 m/s2. 
Definitions:
Standard Error
The standard deviation of the sampling distribution of a statistic, commonly the mean.
Sample Size
The number of observations or data points collected in a study, used to make inferences about a population.
Standard Error
A statistical measure that quantifies the amount of variation or dispersion of a sample statistic compared to the true population parameter.
Standard Deviation
A statistic that measures the dispersion or variability of a dataset relative to its mean.
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