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Question 19M.2.HL.TZ2.1ai

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.HL.TZ2.1ai
Level HL Paper 2 Time zone TZ2
Command term Calculate Question number ai Adapted from N/A
ai.
[Maximum mark: 2]
19M.2.HL.TZ2.1ai

A student strikes a tennis ball that is initially at rest so that it leaves the racquet at a speed of 64 m s–1. The ball has a mass of 0.058 kg and the contact between the ball and the racquet lasts for 25 ms.

(ai)

Calculate the average force exerted by the racquet on the ball.

[2]

Markscheme

F = Δ m v Δ t / m Δ v Δ t / 0.058 × 64.0 25 × 10 − 3  ✔

F = 148 «N»≈150«N»  ✔

 

 

Examiners report

At both HL and SL many candidates scored both marks for correctly answering this. A straightforward start to the paper. For those not gaining both marks it was possible to gain some credit for calculating either the change in momentum or the acceleration. At SL some used 64 ms-1 as a value for a and continued to use this value over the next few parts to the question.

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