Chapter 11, Problem 78EAP

In Problems 75 through 78 you are given the equation(s) used to solve a problem. For each of these, you are to

a. Write a realistic problem for which this is the correct equation(s).

b. Finish the solution of the problem, including a pictorial representation.

75. (0.10 kg)(40 m/s) - (0.10 kg)(-30 m/s) = $\frac{1}{2}$ (1400 N) ?t

76. (600 g)(4.0 m/s) = (400 g)(3.0 m/s) + (200 g)(v_ix)₂

77. (3000 kg)v_fx= (2000 kg)(5.0 m/s) + (1000 kg)(-4.0 m/s)

78. (0.10 kg + (0.20 kg)v_1x= (0.10 kg)(3.0 m/s)

$\frac{1}{2}$ (0.30 kg)(0 m/s)2 + $\frac{1}{2}$ (3.0 N/m)(?x₂)2

= $\frac{1}{2}$ (0.30 kg)(v_1x)2 + $\frac{1}{2}$ (3.0 N/m)(0 m)2