A model rocket is launched from the ground. The height 'h' reached by the rocket after t seconds from lift off is given by h(t) = -`5t^(2) + 100t, 0 le t le 20`. At what time the rocket is 495 feet above the ground?

A model rocket is launched vertically into the air such that its height at any time, t, is given by the function h(t)=-16t^(2)+80t+10 . What is the maximum height attained by the model rocket?

Joe throws a ball upwards from a height of 12 feet from ground level. The height of the ball above the ground after time t second from when the ball was thrown is given by the expression h(t)= -t^(2)+at+b . The ball comes back to the ground after 8 second. What is the value of (a+b)?

Joe throws a ball upwards from a certain height above the ground level. The height of the ball above the ground after time t seconds from when the ball was thrown is given by the expression h(t)= -(t-a)^(2)+b . The ball reaches a maximum height of 25 feet after 4 seconds. After how much time [in seconds] will the ball reach the ground level?

Soumya throws a ball upwards, from a rooftop, 80 m above. It will reach a maximum height and then fall back to the ground. The height of the ball from the ground at time 't' is 'h', which is given by h=-16t^(2)+64t+80 How long will the ball take to hit the ground ?

The formula to determine the height of the rocket above the ground at any time during the rocket’s flight is given by: h=119t-7t2 where t =the time, in seconds, that has elapsed since the rocket was launched, and h = the height, in meters, of the rocket above the ground at time t . The value of h was 0 when the rocket hit the ground, How many seconds after the rocket was launched did it hit the ground?

Soumya throws a ball upwards, from a rooftop, 80 m above. It will reach a maximum height and then fall back to the ground. The height of the ball from the ground at time 't' is 'h', which is given by h=-16t^(2)+64t+80 What is the height reached by the ball after 1 second ?

A body when released from the top of a tower of height h reaches the ground in time T. At what time it is at a height h/2 above the ground?

Soumya throws a ball upwards, from a rooftop, 80 m above. It will reach a maximum height and then fall back to the ground. The height of the ball from the ground at time 't' is 'h', which is given by h=-16t^(2)+64t+80 What is the maximum height reached by the ball ?

A body is released from the top of a tower of height h meters. It takes t seconds to reach the ground. Where is the body at time t/2 seconds?