RI 2023 Y5 H2 Phy Promo Sect B

© Raffles Institution 9749 Name: ( ) CT Group: 24S0 RAFFLES INSTITUTION 2023 YEAR 5 PROMOTIONAL EXAMINATION 2 October 2023 H2 PHYSICS RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES Section B INSTRUCTIONS TO CANDIDATES Write your name, index number and CT Group. Write your answers to Section B in the spaces provided on the question paper. You are advised to write all your workings and answers clearly. Marks may be deducted for unclear workings. For Examiner’s Use Section A MCQ / 15 Section B 1 / 10 2 / 10 3 / 10 4 / 8 5 / 12 Section C 6 / 15 7 / 15 Deductions Total / 95 This document consists of 14 printed pages.

2 © Raffles Institution 9749 [Turn over Section B (50 marks) 1 A ball is kicked with an initial velocity u at an angle of 32.0° from the ground towards a vertical wall. The ball hits the top of the wall after a time of 1.40 s. The path of the ball, assuming negligible air resistance, is shown in Fig. 1.1. The horizontal distance between the initial position of the ball and the base of the wall is 20.0 m. Fig. 1.1 (not to scale) (a) Calculate the horizontal component of u. horizontal component of u = 1m s− [1] (b) Calculate the vertical component of u. vertical component of u = 1m s− [1] (c) Calculate the time for the ball to reach its maximum height above the ground. time = s [2] u 20.0 m path of ball wall ground ball

3 © Raffles Institution 9749 [Turn over (d) (i) The ball is kicked at time 0 st = . On Fig. 1 .2, sketch the variation with time t of the vertical component v y of the velocity of the ball until it hits the wall at 1.40 st = . Include in your sketch, the values of the initial vertical velocity, the time at maximum height and the final vertical velocity of the ball when it hits the top of the wall. Take direction upwards as positive. Fig. 1.2 [2] (ii) Explain how the