Help Victoria calculate the time she rested (don't forget to write the units). At first she moves 10 meters in 3 seconds, rests 5 seconds. After that, she jumps for 25 meters in 30 seconds and then rests 12 seconds, finally she makes a giant step (1 m) in 2 seconds.
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Answer:
Given:
The initial speed of the particle is u=10m/s
The time after which the velocity changes is t=3 s
The final velocity of the particle is v=16 m/s
The acceleration of the particle can be obtained as:
a=
t
v−u
Substituting the values in above equation
a=
3
16−10
=2 m/s
2
Now velocity at 2 s, before the given instant. In this case, the initial velocity will become the final velocity after 2 seconds from the instant.
v=u+at
10=u+2×2
∴u=6m/s
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