The froghopper (philaenus spumarius), the champion leaper of the insect world, has a mass of 12.3 mg. it can leave the ground with a speed as high as 4.0 m/s in the vertical direction. the jump itself lasts a mere 1.0 ms before the insect is clear of the ground. assuming constant acceleration, find the force that the ground exerts on the froghopper during its jump.