Rachael shoots a rocket straight upward with an initial velocity of 8 meters per second from a height of 20 meters. The distance d (in meters) of the ball from the ground after t seconds is given by the equation d = 20 + 8t - 0.5g(t²), where gravity g is 9.8 m/s². After approximately how many seconds does the rocket strike the ground?(A)  0.5 seconds(B) 1 second(C) 1.5 seconds(D) 2 seconds(E) 3 seconds

h=−4.9t 2 +25tThe equation above expresses the approximate height ℎ, in meters, of a ball 𝑡𝑡 seconds after it is launched vertically upward from the ground with an initial velocity of 25 meters per second. After approximately how many seconds will the ball hit the ground?A3.5B4.0C4.5D5.0

(a)The function 𝑓(𝑡)=−5𝑡2+20𝑡+60f\left(t\right)=-5t^2+20t+60f(t)=−5t 2 +20t+60 models the approximate height of an object 𝑡tt seconds after it is launched. How many seconds does it take the object to hit the ground? (Enter only the number)

A rocket is launched in the air. Its height in feet is given by h, of, t, equals, minus, 16, t, squared, plus, 8, th(t)=−16t 2 +8t where tt represents the time in seconds after launch. How many seconds have gone by when the rocket is at its highest point?

A ball is thrown vertically upwards with a velocity of 49 m/s and g =9.8 m/s2Calculate the max height it rises up to?112.5 mwrong245 m122.5 mcorrectnone of these12. Calculate the total time it takes to reach back to surface?20 sec

18. A cannon shell is fired straight up from the ground at an initial speed of 225 𝘮/𝘴. After how much time is the shell at a height of 6.20 3 102 𝘮 above the ground and moving downward?