Question

2
2. The displacement of a particle
moving in a straight
line is given by x = 2tsquare+t+5 where is expressed
in meters and t is second. The acceleration at t=2sec is
a) 4 m/s
b)10m/s
c)8m/s
d)15m/s
​

Answer 1

x=2t²+t+5

To find velocity different displacement x

dx/dt = v= 4t

To find acceleration differentiate it again

dv/dt = a = 4

So the acceleration is 4m/s²