(a) The time of upright movement of a baseball
The time of downward movement of a baseball
The upright distance traveled by a baseball
"h_{1}=\\frac{v_1^2}{2g}=\\rm\\frac{(20\\: m\/s)^2}{2\\times 9.8\\: m\/s^2}=20.4\\: m"The downward distance
"h_2=\\frac{gt^2}{2}=\\rm\\frac{9.8\\: m\/s^2\\times (13.5\\: s)^2}{2}=887.6\\: m"Hence, the initial height of a baseball above the ground
"H=h_2-h_1=\\rm 887.6\\: m-20.4\\: m=867\\: m"(b) The velocity of the baseball just before it hits the ground
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