The height of a golf ball above the ground in metres is modelled by the function h(t)=-4.9t^2+20t+3, where h is the height the golf ball is above the ground and t is the time in seconds after the ball is hit.
a) Use graphing technology to determine the maximum height the golf ball will reach rounded to the nearest tenth of a metre
b) For how long is the golf ball in the air? Round answer to nearest tenth of a second.

Question

The height of a golf ball above the ground in metres is modelled by the function h(t)=-4.9t^2+20t+3, where h is the height the golf ball is above the ground and t is the time in seconds after the ball is hit.
a) Use graphing technology to determine the maximum height the golf ball will reach rounded to the nearest tenth of a metre
b) For how long is the golf ball in the air? Round answer to nearest tenth of a second.

jdoe0001 · Answer

|dw:1402359869858:dw|  notice is just a parabola equation, leading term coefficient is negative, thus is going downwards

thus graph it, and get those values :)