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denis23 [38]
3 years ago
5

A ball is throw at an angle of 30 degrees off the horizontal, with an initial velocity of 28 m/s. what is the maximum height the

ball will reach?​
Physics
1 answer:
aksik [14]3 years ago
8 0

{\mathfrak{\underline{\purple{\:\:\: Given:-\:\:\:}}}} \\ \\

\:\:\:\:\bullet\:\:\:\sf{Angle \ of \ projection = 30^{\circ} }

\:\:\:\:\bullet\:\:\:\sf{Initial \ velocity \ of \ projectile = 28 \: m/s^{-1} }

\\

{\mathfrak{\underline{\purple{\:\:\:To \:Find:-\:\:\:}}}} \\ \\

\:\:\:\:\bullet\:\:\:\sf{Height_{\:(max)}\: reached\: by \:the \:projectile }

\\

{\mathfrak{\underline{\purple{\:\:\: Calculation:-\:\:\:}}}} \\ \\

☯ <u>As</u> <u>we</u> <u>know</u> <u>that</u>,

\\

\dashrightarrow\:\: \sf{ H = \dfrac{u^2\;sin^2\theta}{2\;g} }

\\

\dashrightarrow\:\: \sf{H = \dfrac{(28)^2\;sin^2 30^{\circ}}{2\;(9.8)}  }

\\

\dashrightarrow\:\: \sf{H = \dfrac{784 \times \;sin^230^{\circ}}{19.6}  }

\\

\dashrightarrow\:\: \sf{  H = \dfrac{784}{19.6}\times sin^2 30^{\circ}}

\\

\dashrightarrow\:\: \sf{  H = \dfrac{784}{19.6}\times \bigg(\dfrac{1}{2}\bigg)^2 }

\\

\dashrightarrow\:\: \sf{  H = \dfrac{784}{19.6}\times \dfrac{1}{4} }

\\

\dashrightarrow\:\: {\boxed{\sf{H=10\:m  }}}

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Answer:

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thermal energy = mgΔh

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                         = 188160 Joule

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(c) What is the average force of friction if the hill has a slope 2.5º above the horizontal?

f d  = mgΔh

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