Can someone help me with problem 1 please? webassign.net 2A Sp2018 Assgt1o Inbox

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Can someone help me with problem 1 please?

webassign.net 2A Sp2018 Assgt1o Inbox ( Fresno State Mail Assignment Submission For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer Assignment Scoring Your last submission is used for your score. -/1 points SerCP11 3P035MI My Notes Ask Your Towns A and B in the figure below are 80.0 km apart. A couple arranges to drive from town A and meet a couple driving from town B the lake, L. The two couples leave simultaneously and drive for 2.15 h in the directions shown. Car 1 has a speed of 87.0 km/h. If the cars arrive simultaneously at the lake, what is the speed of car 2? km/h 40.0 80.0 km Need Help?Readt Master Submit Answer Save Progress Practice Another Version 2. 1 points SerCP11 3.P.037 My Notes Ask Your Te A father demonstrates projectile motion to his children by placing a pea on his fork's handle and rapidly depressing the curved tines, aunching the pea to heights above the dining room table. Suppose the pea is launched at 7.67 m/s at an angle of 67.0° above the table. With what speed (in m/s) does the pea strike the ceiling 1.80 m above the table? HINT

Explanation / Answer

Ans)

First, determine the x and y components of the pea's speed.
It is launched at 7.67 m/s at an angle of 670 above the table.
X component: cos(67)x7.67 m/s = 2.99 m/s
Y component: sin(67)x 7.67 m/s = 7.06 m/s

Determine the time it takes for the pea to strike the ceiling 1.80 m above the table:
Use the kinematics equations

d = vit + 0.5at2
1.80 = (7.06xt) +( 0.5x-9.8xt2)
Solve for t using the quadratic equation:
t = 0.331 seconds

Finally, determine the speed:
Use the kinematics equation

vf = vi + at
vf = 7.06 + (-9.8)x(0.331)

= 3.81 m/s

The speed does the pea strike the ceiling is

vf=3.81m/s

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