a.) A 3.00-kg mass undergoes an acceleration given by a = (2i+5j ) m/s2. The magnitude of the net force is?
b.) A 10-kg block on a horizontal plane is connected by a cord over a massless, frictionless pulley to a second block of mass m. What hanging mass m is needed so that the 10-kg block can move at acceleration of 2.8 m/s2 ?