Calculate the speed of a runner who runs 5m cast and then Sm north in 3 seconds

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Answer///air resistance,drag;

At maximum height, kinetic energy is converted in potential energy  formula: at max height, ke = ½ * 0.27kg * (16m/s) ² = 34.56 j  so the remaining pe = (41.70 – 34.56)= 7.14 j = 0.27 kg * 9.8m/s² * h  = (9.8/7.14 * 0.27)so max height h = 5.08 or 5 m