A soccer player kicks a 0 4 lb ball with an average force of 6 lb, g.v.ng it a v

Question

A soccer player kicks a 0 4 lb ball with an average force of 6 lb, g.v.ng it a velocity of 80 A 35 ton boxcar travelling at 25 ft/s is coupled at the rear by a 40 ton boxcar travelling at 45 ft/s in the same direction. Determine the final velocity of the boxcars. Crate A is moved 6 ft to the right by the forces shown in the figure. Determine the work done. Block A in the figure weighs 400 lbs has a velocity of 18 ft/s down the slope. How far will the block slide along the slope before stopping? A bicycle wheel held up off the grounds is spun at 400 rpm and is then allowed to coast to a stop while turning through 500 revolutions. How long does it take to stop? (Assuming constant deceleration). For the given system in the figure, determine the angular acceleration of the wheel and the tangential velocity of point A Determine the maximum horizontal distance that a projectile will have at a height of 70 m above its origin if it is fired at an angle at 80 degree from horizontal with a velocity of 55m/s A car accelerates at 2.5 m/s 2 to reach a velocity of 25 m/s in a distance of 60 m Determine its initial velocity and time elapsed

Explanation / Answer

8) According to conservation of momentum,

        m1v1+m2v2=(m1+m2)V

where, m1=mass of 1st box car

             m2=mass of 2nd box car

v1=velocity of 1st box car

v2=velocity of 2nd box car

V=final velocity

So,by putting all values,

35*25+40*45=(35+40)V

V=35.67ft/s

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