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Question 21M.2.SL.TZ1.1d.i

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.SL.TZ1.1d.i
Level SL Paper 2 Time zone TZ1
Command term Determine Question number d.i Adapted from N/A
d.i.
[Maximum mark: 2]
21M.2.SL.TZ1.1d.i

Two players are playing table tennis. Player A hits the ball at a height of 0.24 m above the edge of the table, measured from the top of the table to the bottom of the ball. The initial speed of the ball is 12.0 m s−1 horizontally. Assume that air resistance is negligible.

The ball bounces and then reaches a peak height of 0.18 m above the table with a horizontal speed of 10.5 m s−1. The mass of the ball is 2.7 g.

(d.i)

Determine the kinetic energy of the ball immediately after the bounce.

[2]

Markscheme

ALTERNATIVE 1 

KE = 12mv2 + mgh = 120.0027 ×10.52 + 0.0027 × 9.8 × 0.18 ✓

0.15 «J» ✓

 

ALTERNATIVE 2

Use of vx = 10.5 AND vy = 1.88 to get v = «10.52 + 1.882» = 10.67 «m s−1» ✓

KE = 12 × 0.0027 × 10.672 = 0.15 «J»  ✓

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