The height (in metres) of a ball thrown by Meena is modelled by h(t) = -5t^2 + 20t, where t is time in seconds. At what positive value of t does the ball return to the ground (h = 0)?

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Accepted Answer

4. Set -5t^2 + 20t = 0, i.e. -5t(t - 4) = 0. So t = 0 (start) or t = 4. The positive return time is t = 4 s.

The height (in metres) of a ball thrown by Meena is modelled by $h (t) = - 5 t^{2} + 20 t$ , where $t$ is time in seconds.
At what positive value of $t$ does the ball return to the ground $(h = 0)$ ?

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More Class 10 Zeroes of a Polynomial practice

The height (in metres) of a ball thrown by Meena is modelled by h(t)=−5t2+20t, where t is time in seconds.At what positive value of t does the ball return to the ground (h=0)?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Zeroes of a Polynomial practice

The height (in metres) of a ball thrown by Meena is modelled by $h (t) = - 5 t^{2} + 20 t$ , where $t$ is time in seconds.
At what positive value of $t$ does the ball return to the ground $(h = 0)$ ?