To find "s", you can use the Pythagorean theorem(which you can only use for right triangles):
a² + b² = c² (c is the hypotenuse/the longest side of the triangle)
t = 18 (hypotenuse)
r = 12
s = ?
Plug in the numbers into the equation
a² + b² = c²
(12)² + b² = (18)²
144 + b² = 324 Subtract 144 on both sides
b² = 180 Square root both sides
b = √180 or 13.4
Answer:
Not sure if this is correct but maybe it is 34?
Answer:
t = 2secs
Step-by-step explanation:
Given the height above the surface expressed as h = -16t^2 + 64 t + 80.
The velocity of the rocket at its maximum height is zero. Hence;
v(t) = dy/dt = 0
dy/dt = -32t + 64
0 = -32t + 64
32t = 64
t = 64/32
t = 2secs
Hence the rocket will hit the lake after 2 secs
