arone m [1] A drone moves vertically so that its height, x metres, after time 1 seconds is given by x = } P + 112 + 15t + 5 for 1 2 0. Answer the following: initial height dx dt use @ for 2 dx d12 m/s rate of change of x when i = 5: 10 [2] 11 = [2] [2] S [2] stationary value occurs when t = This is a ? minimum maximum [1] increasing decreasing When 1 = 2 the height is [1] Mark it