Several information's that are required to get to the answer of the question is already given in the question. It is important to write them down first and then start solving the problem. Force = 400 newton Mass = 100 kg We already know that Force = Mass * Acceleration Then Acceleration = Force/Mass = 400/100 = 4 m / S^2 The acceleration of the object is 4 m/s$2. I hope the procedure is clear for your understanding. In future you can use this method for solving such questions.
