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**1. Homework Statement**

Three particles move along the x-axis, each starting with v= 10m/s at t_0 = 0s. The graph for A is a position-versus-time graph; the graph for B is a velocity-versus-time graph; the graph for C is an acceleration-versus-time graph.

Find each particle's velocity at t = 7.0s. Work with the geometry of the graphs, not with kinematic equations.

http://img27.imageshack.us/img27/5497/phys.jpg [Broken]

**2. Homework Equations**

A=1/2(b)(h)

A=bh

**3. The Attempt at a Solution**

Particle A:

A=1/2(5)(50)

=125m/7s

=-17.85m/s, negative because the particle is moving leftwards.

Particle B:

Since this is a Velocity vs. Time graph, the Velocity axis shows the object to be moving at 20m/s.

Particle C:

At t=2s, the car stops(?) and begins to accelerate till t=8s. At t=7s, would the acceleration be 50m/s^2?

Can anyone check if I'm doing these correctly at all, and if not can you advise me, please?

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