Question

The velocity of a moving body increases from 10m/s to 15 m/s in 5 seconds.calculate its acceleration.

Answer 1

cos²A = 1-sin²A, i.e., cosA =

$\frac{ + }{} \sqrt{1 - sin {}^{2} \: a }$

This gives

cosA =

$\sqrt{1 - sin {}^{2} a}$

Hence,

tanA =

$\frac{sin \: a}{cos \: a} = \frac{sin \: a}{ \sqrt{1 - sin {}^{2} } \: a}$