If u=20m/s, t = 5s, acceleration 4 m/s then find final velocity and mention about direction
Answers
Explanation:
How do you find final velocity?
Work out which of the displacement (S), initial velocity (U), acceleration (A) and time (T) you have to solve for final velocity (V).
If you have U, A and T, use V = U + AT.
If you have S, U and T, use V = 2(S/T) - U.
If you have S, A and T, use V = (S/T) + (AT/2).
14-Dec-2021
Solution
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Given, u=20m/s
t
1
=5s
t
2
=8s
Graph: (Refer to Image)
(1) Distance travelled in first 5 sec= area of ABDE= 20×s=80m
(2) Distance travelled after the brakes are applied (area of BCD)=
2
1
×8×5=20m
(3) Total distance travelled= AreaofABCDE+AreaofBCD=80+20=100m
(4) Acceleration during the first 5 sec= 0, because uniform velocity.
(5) Acceleration during the last 8 sec= v=0,u=20m/s,t=8sec
⇒v=u+at⇒0=20+a(8)
⇒a=−2.5m/s
2
(slope of the line DC
Explanation:
How do you find final velocity?
Work out which of the displacement (S), initial velocity (U), acceleration (A) and time (T) you have to solve for final velocity (V).
If you have U, A and T, use V = U + AT.
If you have S, U and T, use V = 2(S/T) - U.
If you have S, A and T, use V = (S/T) + (AT/2).