NEET | 2017Basic Maths and Units and DimensionsHard

Question

The x and y coordinates of the particle at any time are x = 5t - 2t2 and y = 10t respectively, where x and y  are in meters and t in seconds. The acceleration of the particle at t = 2s is :-

Options

A.

5 m/s2

B.

- 4 m/s2

C.

- 8 m/s2

D.

0

Solution

vx = 5 - 4t, vy = 10
ax = - 4, ay = 0
a→=axi→+ayj→
a→=-4i→m/s2

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