A STONE IS THROWN STRAIGHT UP INTO THE AIR AND HAS A HANG TIME OF 5 SECONDS FIND THE HEIGHT TO WHICH THE BALL REACHES ITS PEAK
Answer
Using newton second equation of motion
v=u+atv=u+atv=u+at
0=u−gt0=u-gt0=u−gt
u=gt
So maximum height
H=u22g=g2t22g=gt22=10×5×52=125mH=\frac{u^2}{2g}\\=\frac{g^2t^2}{2g}\\=\frac{gt^2}{2}\\=\frac{10\times5\times5}{2}\\=125mH=2gu2=2gg2t2=2gt2=210×5×5=125m
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