AnSWErS to tHE StudEnt'S Book ExErCiSES - Hodder Plus Home

7 a)y302826242220181614121086420y ax 2 b1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 x 2b) a 5 21 6 0.2, b 5 30 6 2Mixed exercise 16 (page 229)1 Velocity 5 m/s at start, slowing down. Stops att 5 4. (Negative acceleration until t 5 6, thenpositive acceleration.) Then moves in oppositedirection. Stops again when t 5 9.2 a), b) y x 2 5x 3y1614121086421 024681 2 3 4107x 2y 1112x4 a)y0246810121 2 3 4 5 6 7xy x 2 7xb) (i) x 5 1.7 and x 5 5.3(ii) x 5 0.2 and x 5 4.85 a) y363432302826242220181614121086426 a)2 1 02b) x 5 0.3 and x 5 3.7y30123y x 3 1y 9y 2x 1y x 2 4x 3y 24 5 6 7 8xc) (21, 9) and (2.5, 23.25)203 a) y87654y x 2 2xy x 1y 1103 2 1 010123y xx322011 0 1 2 3 4x1b) x 5 20.3 and x 5 3.330b) (i) x 5 1.3(ii) x 5 1.3Higher WJEC GCSE Mathematics © 2010, Hodder EducationAnswers to the Student’s Book exercises 211