Do it as soon as possible

1.What amount of force is to be applied to a body of mass of 4 Kg in order to accelerate it by 10 ms2 when frictional force of the path is 2.5 NKgl? 2. A mass of 2 kg is released from the top of a slope which is angled at 300 above the horizontal. If the force of friction is 4 N, determine the acceleration of the mass when released and the time taken for it to travel 'lm down the slope. 3. A leftward force of SM is applied to 10 kg object to accelerate it across a rough surface at constant velocity. The coefcient of friction is greater than zero. Calculate the acceleration of the object