A boat of mass 1150 kg started from rest (it was anchored in a river) and moved under the action of two forces.One, due to the current in the river,

had a magnitude of 540 N and acted in a Southerly direction. The other, a propulsive force from the propeller and directed by the boat's rudder, had a magnitude of 920 N and acted in a North-Westerly direction (45° North of West). Calculate: a)the net force on the boat; b)and its initial acceleration.