Please help me to solve 2 questions (Q3, Q4) that consider the following information.

An object is moving along a straight line. Its velocity (in cm/s) at time t seconds is given by

v(t)=4cos(2t)+2sin(5t)

Q1: What is the displacement (in cm) between t=2 and t=3? ---> Answer 0.92

Q2: What is the average velocity (in cm/s) between time t=0 and t=5 seconds? --> Answer -0.22

* I couldn't get correct answer below 2questions. Please tell me how to solve below Q3, Q4

Q3

If the initial position is 10cm down the line from a camera (and positive velocity means moving further away from the camera), how far is the object from the camera (in cm) when t=3 seconds?

Q4

What is the acceleration of the object (in cm/s^2) at time t=15 second?