What is the acceleration of the ball at the highest point?
0 m/s2
9.8 m/s2
-9.8 m/s2
none of these
It is the acceleration due to gravity, g, which is always downwards. So, - 9.8 m/s2
If A is the area and 2s the sum of 3 sides of triangle then
In △ABCcos2A2a+cos2B2b+cos2C2c