A small radio controlled car is moving to the right at 14 m/s at t=0s, with a constant acceleration of 2.0 m/s2 [L]. FIND:
The velocity of the car at t=6.0s
How long it takes the car to come to a rest.
At what time is the displacement of the car is equal to 40.0 m [R]
1
Expert's answer
2020-02-17T09:20:00-0500
The velocity of the car at t=6.0s
"v(6)=v_0-at_0=14-2(6)=2\\frac{m}{s}"
Time is
"T=\\frac{v_0}{a}=\\frac{14}{2}=7\\ s"
We have
"s=v_0t-0.5at^2"
"40=14t-0.5(2)t^2"
"t_1=4\\ s"
"t_2=10\\ s"
The second time will be when car returns backwards.
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