Question

A 6.0-N force acts for 2.0 s on an object. The force suddenly increases to 15 N and acts for one more second. What impulse was imparted by these forces to the object?

Answer 1

Impulse \(\Delta p\) from a force \(F\) acting for a time interval \(\Delta t\) is:
\(\Delta p = F\Delta t\)
Impulse is linear so work out the impulse from each force and add them together.