Question $2$: A scraper, whose weight on the driving wheels is $15330kg$ has a gross weight of $29030kg.$ What is the maximum grade the scraper can ascend,

a$)$ If the road surface is wet earth having a rolling resistance factor of $60k\frac{g}{t}?$

b$)$ If the road surface is dry earth having a rolling resistance factor of $50k\frac{g}{t}?$

Answer: a$)$ Maximum grade $=18\%,$ b$)$ Maximum grade $=26\%$