Solving a Linear Motion Question: Two Cars, 70km & 4.4m/s & 2.5m/s

AI Thread Summary
The discussion revolves around a linear motion problem involving two cars traveling towards each other and in the same direction, with speeds of 4.4 m/s and 2.5 m/s over a distance of 70 km. Participants emphasize the importance of attempting to solve the problem independently before seeking help, as it is a homework question. They encourage the poster to share any initial thoughts or calculations made regarding the problem. The forum also notes that such questions are typically moved to a designated homework section for better organization. Engaging with the problem actively is essential for learning and understanding the concepts involved.
agbe981
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i have a problem solving a linear motion question, this is the question

two cars moving in a straight line of 70km with velocities 4.4m/s and the other 2.5m/s. when will they meet if

a) they moved towards each other
b) they moved in the same direction.
 
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two cars moving in a straight line of 70km with velocities 4.4m/s and the other 2.5m/s. when will they meet if

a) they moved towards each other
b) they moved in the same direction.
 
agbe981 said:
i have a problem solving a linear motion question, this is the question

two cars moving in a straight line of 70km with velocities 4.4m/s and the other 2.5m/s. when will they meet if

a) they moved towards each other
b) they moved in the same direction.
Welcome to PF,

Firstly we have Homework forums for textbook questions, don't worry about it now, a mentor will move your posts there in due course.

Secondly, we don't solve homework questions for you! You have to do some work of your own! What have you attempted thus far? Have you any ideas?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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