Anil throws a ball upward from the ground. Its height h (in metres) after t seconds is h = 20t - 5t^2. After how many seconds (other than t = 0) does the ball return to the ground (h = 0)?

Question

Accepted Answer

4. Set h = 0: 20t - 5t^2 = 0, so 5t(4 - t) = 0, giving t = 0 or t = 4. The ball lands at t = 4 seconds.

Anil throws a ball upward from the ground. Its height $h$ (in metres) after $t$ seconds is $h = 20 t - 5 t^{2}$ .
After how many seconds (other than $t = 0$ ) does the ball return to the ground $(h = 0)$ ?

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More Class 10 Standard Form and Roots practice

Anil throws a ball upward from the ground. Its height h (in metres) after t seconds is h=20t−5t2.After how many seconds (other than t=0) does the ball return to the ground (h=0)?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Standard Form and Roots practice

Anil throws a ball upward from the ground. Its height $h$ (in metres) after $t$ seconds is $h = 20 t - 5 t^{2}$ .
After how many seconds (other than $t = 0$ ) does the ball return to the ground $(h = 0)$ ?