Question

If I throw a ball straight up at 20 m/s, at what time will the ball lose speed? Ignore air resistance and g= 9.8 m/s2

Answer 1

Given data

*The ball is thrown straight upwards at a speed is u = 20 m/s

*The value of the acceleration due to gravity is g = 9.8 m/s^2

*The value of the final velocity of the ball at maximum height is v = 0 m/s

The formula for the time taken by the ball to lose its speed is given by the equation of motion as

`v=u-gt`

Substitute the known values in the above expression as

`\begin{gathered} 0=20-(9.8)t \\ t=2.04\text{ s} \end{gathered}`