We need to find the distance travelled by the object during that time. Second equation of motion gives the distance travelled by the object. It is given by :
So, the distance travelled by the object is 192 meters.
We can find the force by using the following formula; N = ma + mg Fa = ma = 76 x 1.2 = 91.2 Fg = mg = 76 x 9.8 = 744.8 N = 91.2 + 744.8 = 836 So, the force is 836 N.