Answers to questions in the Student Book - Hodder Plus Home
Answers to questions in the Student Book - Hodder Plus Home
Answers to questions in the Student Book - Hodder Plus Home
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GCSE Physics for CCEA second editionb) average speed = (30 + 0) ÷ 2= 15m/sc) s = ut + ½ at 2= 0 + ½ x 10 x 3 2= 45 m18. s = 500m, u = 0m/s, v = ?, a = 10 m/s 2 , t = ?a) v 2 = u 2 + 2as= 2 x 10 x 500= 10 000v = 100m/sb) v = u + at100 = 0 + 10t10t = 100t = 10s19. u = 50m/s, v= 0, a = -10m/s 2 , t = ?, s = ?a) v = u + at0 = 50 – (10 x t)10t = 50t = 5sb) s = ut + ½ at 2= (50 x 5)-(½x10x25)= 250 – 125= 125m20. a) u = 0 m/s, v = ?, a = 3 m/s 2 , t = 5sv = u + at= 0 + 3 x 5= 15m/sb) u = 15, v = 0, t = ?, a = -0.5v = u + at0 = 15 – (0.5 x t)0.5t = 15t = 30sarea of triangle = ½ x b x h= ½ x 35 x 15= 262.5mc)4