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Question 19N.2.SL.TZ0.1b

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.SL.TZ0.1b
Level SL Paper 2 Time zone TZ0
Command term Show that Question number b Adapted from N/A
b.
[Maximum mark: 2]
19N.2.SL.TZ0.1b

The graph shows the variation with time t of the horizontal force F exerted on a tennis ball by a racket.

The tennis ball was stationary at the instant when it was hit. The mass of the tennis ball is 5.8 × 10–2 kg. The area under the curve is 0.84 N s.

(b)

Show that the average force exerted on the ball by the racket is about 50 N.

[2]

Markscheme

use of Δt = «(28 – 12) × 10–3 =» 16 × 10–3 «s» ✔

F¯ =«∆p∆t=» 0.8416×10-3 OR  53 «N» ✔

NOTE: Accept a time interval from 14 to 16 ms
Allow ECF from incorrect time interval

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