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?

A ball dropped from a height 'h' reaches the ground in time 'T'. What is its height from the ground at time T/2 ?

A ball is thrown upwards with a speed u from a height h above the ground.The time taken by the ball to hit the ground is

A ball is thrown vertically upward with a speed v from a height h above the ground . The time taken for the ball to hit the ground is

A ball is thrown upwards with a speed u from a height h above the ground.The time taken by the ball to hit the ground is

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 ?

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 ?

When a ball is thrown straight up at an initial velocity of 54 feet per second. The height of the ball t seconds after it is thrown is given by the function h(t)=54t-12t^(2) . How many seconds after the ball is thrown will it return to the ground?

A ball is thrown straight upward with a speed v from a point h meter above the ground. The time taken for the ball to strike the ground is

A ball is thrown vertically upwards from the top of tower of height h with velocity v . The ball strikes the ground after time.