Question

The dependence of velocity of a body with time is given by the equation v = 20 + 0.1t². The body is in(a) uniform retardation(b) uniform acceleration(c) non-uniform acceleration(d) zero acceleration.

Answer 1

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Answer 2

Answer:

If an object having initial velocity u attains a velocity v after a time t, then acceleration a = (v - u/t. When velocity of an object increases with time, then acceleration is positive. If velocity of an object decreases with time, then acceleration is negative. Negative acceleration is also called retardation. Acceleration can be uniform or non-uniform. A freely falling body has a uniform acceleration of 9.8 m/s2 When a car moves with variable velocity, then the acceleration of car is non-uniform. For an object moving with uniform velocity, the acceleration is zero.