Course Home Weekly 02: Motion Diagrams & 1D Kinematics Item 26 Find the

Question

Course Home Weekly 02: Motion Diagrams & 1D Kinematics Item 26 Find the velocity of the particle A at t = 3.5 s (Figure 1) Express your answer with the appropriate units. Three particles move along the x-axis, each starting at to 0s. The graph for A is a position-versus-time graph; the graph for B is a velocity-versus-time graph; the graph for C is an acceleration-versus- time graph. Value Units Submit Part B Find the velocity of the particle B at t 3.5 s. (Figure 2) Express your answer with the appropriate units. VB: I Value Units Figure : Submit X Incorrect Try Again; 29 attempts remaining Enter your answer using dimensions of velocity x (m) Particle A 30 20 10 0 10 -20 -30 Part c t (s) Find the velocity of the particle C at t 3.5 s. Particle starts with v Express your answer with the appropriate units. 10 m/s at to 0 s. (Figure 3)

Explanation / Answer

part A)

velocity of particle A at t = 3.5 s

vA = (0 - 30)/(5 - 2)

vA = -10 m/s

part B)

velocity of particle B at t = 3.5 s

from the graph

vB = 15 m/s

the velocity of B is 15 m/s

part C)

for C

vC = initial velocity + area under the curve

vC = 10 + 30 * 2 + (0.50 * 3 * 30 - 0.50 * 1.5 * 15)

vC = 103.4 m/s

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