1. State whether the following are scalar or vector gquantities: (a) A temperature of 50 C (b) A downward force of 80N (c) 300] of work (d) A south-westerly wind of 15 knots (e) 70m distance (f) An acceleration of 25m/s2 at 30 to the horizontal 2. If a=2i+4j 5k and b=3i 2j+6k determine: (Da b (1) |a+bl () axb (iv) the angle between a and b. 3. If velocity 11 = 26m/s at 52 and = 17m/s at 28 calculate the magnitude and direction of 14 + 1, correct to 2 decimal places