Please Help with Challenging physic Question

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?