# 2 particles 1 direction

1. Feb 4, 2005

### runner1738

Two particles are at the same point at the same time, moving in the same direction. Particle A has an inital velocity of 6.4 m/s amd am acceleration of 1.7m/s^2. Particle B has an initial velocity of 2.2 m/s and an acceleration of 5 m/s^2. At what time will B pass A? Answer in units of s.

2. Feb 4, 2005

### christinono

Use the following kinematics formula and equal the distances they travel. Then, solve for time.

$$d = V_it+ \frac{1}{2}at^2$$

3. Feb 4, 2005

### runner1738

so its 6.4t+1/2*1.7t^2=2.3t+1/2*5t^2 ?

4. Feb 4, 2005

### christinono

precisely :!!)

5. Feb 4, 2005

### runner1738

got it thanks