DP Physics (first assessment 2025)
Question 19M.2.HL.TZ2.9b
Date | May 2019 | Marks available | [Maximum mark: 3] | Reference code | 19M.2.HL.TZ2.9b |
Level | HL | Paper | 2 | Time zone | TZ2 |
Command term | Calculate | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 3]
19M.2.HL.TZ2.9b
(b)
A solid sphere of mass 1.5 kg is rolling, without slipping, on a horizontal surface with a speed of 0.50 m s-1. The sphere then rolls, without slipping, down a ramp to reach a horizontal surface that is 45 cm lower.
Calculate the speed of the sphere at the bottom of the ramp.
[3]
Markscheme
Initial «=0.26J» ✔
Final «=6.88J» ✔
«m s–1» ✔
Other solution methods are possible.
Examiners report
Although there were many correct answers, many candidates forgot to include the initial kinetic energy of the ball at the top of the ramp. The process followed to obtain the answer was too often poorly presented, candidates are encouraged to explain what is being calculated rather than just writing numbers.

