Question

With what speed must an object be projected vertically up ward for it to reach a maximum height of 20m above its starting point? ( g=10m/s²

Answer 1

Step-by-step explanation:

Let the thrown speed of the ball be u. At the top, the final speed (v) of the object would be zero. From the kinematic equation, v 2 = u 2 − 2 g h 0 2 = u 2 − 2 × 9.80 × 50 ⇒ u = 31.30 m / s .