The x and y coordinates of the particle at any time are x = 5t - 2t- and y = 10t respectively, where x and y are in metres and t in seconds. The acceleration of the particle at t = 2 s is (a) 5 m s-2 (b) -4 m s-2 (c) -8 m s-2 1 (d) o
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THE PROCESS IN WHICH PLANTS MAKE THIER OWN FOOD IS CALLED PHOTOSYNTHESIS
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option b is write
Explanation
−4 m/s
2
x=5t−2t
2
y=10t
dt
dx
=5−4t
a
x
=
dt
2
d
2
x
=−4
a
y
=
dt
2
d
2
y
=0
a=a
x
+a
y
=−4+0
a=−4 ms
2
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