1. The problem statement, all variables and given/known data A lorry of a mass 1500kg increases its velocity from 12m/s to 20m/s. 2. Relevant equations a) calculate the change in momentum of the lorry. b) The time taken for this change in velocity id 2 minutes. Calculate the average resultant force applied on the lorry. 3. The attempt at a solution I worked out part a) by using the formula momentum= mv and got the ans 12000kgm/s but i dont know how to work out part b. Does anyone know how ?