Grayson is pushing a box across the floor. If the box has a mass of 68.0 kg, and the force of friction is 91.5 N, how much force will Grayson need to exert to accelerate the box at a rate of 1.41 m/s2 ?

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.