# Displacement of a particle is given by the expression x = 3t2 + 7t – 9, where x is in meter and t is in seconds. What is acceleration? CLASS - XI PHYSICS (Kinematics)

2
by AbhishekNair

2014-10-11T22:24:33+05:30

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acceleration =

x = 3t² + 7t - 9

Thus acceleration is 6m/s²
2014-10-12T10:13:47+05:30

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X = 3t² + 7t - 9
differentiate displacement w.r.t. t to get velocity
after differentiating
dx/dt = 6t + 7                           { differentiation of }
v = 6t + 7
again differentiating velocity w.r.t. t to get acceleration
dv/dt = 6
a = 6 m/s²