h=-4.9t^2+d
d = 196
when is h = 0?
4.9 t^2 = d
t^2 = d/4.9
t = sqrt (196/4.9) = sqrt(40) = 2 sqrt (10)
v= (1/3) π r^2 h. What is the radius of a cone with volume 168cm^3 and height 9cm.
v = 168 cm^3
h = 9 cm
168 * 3 = π r^2 (9)
59 = π r^2
r = sqrt(59/π) centimeters
hello please help with this. i can't understand how to complete these questions
2. The height, H meters, of a falling object is related to the time, t seconds, the object has been falling by the formula h=-4.9t^2+d , where d meters is the initial height of the object above the ground. The bankers hall building is 196m tall. express the time an object takes to reach the ground from this height as an exact number of seconds.
5. The volume of a cone with height, h (m), and radius r (m), is given by the formula v=1/3πr^2h. What is the radius of a cone with volume 168cm^3 and height 9cm.
1 answer
1 answer