The ball thrown horizontally The weight of the ball dropped down is a factor in magnitude with gravity playing an important role as well. On the other hand, the ball thrown horizontally has speed which allows magnitude and gravity playing against it, eventually the ball will hit the ground harder than the one dropped straight down
From the Hooke's law , the extension force of an elastic material is directly proportional to the extension. That is, F = k e, where F is the force , k is the constant and e is the extension F = 10 × 10 = 100 N e = 1mm or 0.001 m Hence, k = F/e = 100 N/ 0.001 = 100000 N/m or 100 N/mm