Question

unattempted.
A body starts moving on x-axis whose position at time t is x = (2t2 + 5t)m. Then acceleration
of the body is
(1) 1 m/s2
(2) 4 m/s2
(3) 2 m/s2
(4) 3 m/s2

Answer 1

Step-by-step explanation:

Given,

x=t

2

−4t+6

So, the change in velocity is:

dt

dx

=2t−4

Since velocity is changing,

At t=0,x

1

=6

At t=2,x

2

=2

So the magnitude of the distance traveled is:

6−2=4m

At t=3,x

3

=3

So distance traveled from t=2s to t=3s

x

3

−x

2

=3−2=1m

Thus the total distance is:

4+1=5m

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Answer 2

Answer:

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