
https://www.questionsolutions.com/wp-content/uploads/2017/08/crate11.png
https://www.questionsolutions.com/wp-content/uploads/2017/08/crate12.png
Image from: R. C. Hibbeler, K. B. Yap, and S. C. Fan, Mechanics for Engineers: Dynamics (SI Edition), 13th ed. Singapore: Pearson Education South Asia, 2013.