Question: The 40 kg slider block is moving to the right with a speed of 1.5 m/s when it is acted upon by the forces F1 and F2. If these loadings vary as shown (in the attachment called graph), determine the speed of the block at t =6s. Neglect friction and the mass of the pulleys and cords.(adsbygoogle = window.adsbygoogle || []).push({});

The graph doesn't really look like I drew it but you can get the picture (I hope).

This is what I did so far:

Equation: mV1 + summation (integral of) F * dt = mV2

So I calculated the area under each part of the graph and added them together like so

40*(1.5) + 30*(4-0) + 10*(6-4) + 10*(2-0) + 20*(4-2) + 40*(6-4) = 40V2

340 = 40V2

V2 = 8.5 m/s

Is this right?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Impulse and Momentum (2)

**Physics Forums | Science Articles, Homework Help, Discussion**