Question

A lorry of mass 1000kg moving initially at 10m/s increases to 25/m/scn in 5s. The impulse on the lorry is 15000Ns, calculate the acceleration and distance covered
Solve it

Answer 1

impulse = F dt = m dv/dt * dt = m * delta v is change of momentum
initial momentum = 1000 * 10 = 10,000
final momentum = 1000 * 25 = 25,000
change = 15,000 sure enough
a = change in v / change in t = (25-10) / 5 = 3 m/s^2
d = average speed * time = [ (25+10)/2 ] *5 = 87.5 meters