This is multiple choices can u help me?

69 Two forces of magnitude 20 N and 30 N are acting on a 30 kg object that is lying on a frictionless surface. What is the acceleration (in m/s ) of the object when the two forces are directed perpendicular to each other? a. 0.3 b. 1.2 c. 1.67 d. 3.0 64 A 5.0 N picture is supported by two strings that run from its upper corners to a nail on the wall. If each strings makes a 40" angle with the vertical, the tension in each is . a. 9.3 N b. 3.9 N C. 5.ON J. 10.0 N In the figure if 81 = 82 = 8, them 3. T1 = W/[2sine) C. T2 = WV b. T1 + T2 = W d. T1 = W TRUE OR FALSE Choose letter A on your answer sheet if your answer is TRUE and letter B if FALSE Scalar quantities are quantities that require only the magnitude for their complete description, for example are Forces. $7 Cross product is also known as scalar product because the product of two vectors is a scalar quantity. In Parallelogram Method we can find the resultant by tracing the vector from the tail of the first vector going to the head of the last vector. The product of a scalar quantity and a vector quantity is a vector quantity. 70 A vector whose x-component is -5 units and whose y component is -12 units is located in the second quad rant of the Cartesian plane. 71 As the projectile reaches its maximum height, the projectile has no velocity at all. 72 An object that is thrown upward has an increasing speed and therefore the acceleration vector is positive