helicopter takes-off with zero initial velocity along the vertical with an acceleration of `3m/s^(2)`. Displacement of helicopter in first 2 seconds is?

A helicopter takes off along the vertical with an acceleration a = 3m//s^(2) and zero initial velocity. In a certain time the pilot switches off the engine. At the point of take off, the sound dies away in a time t_(2) = 30 sec . Determine the velocity of the helicopter at the moment when its engine is switched off assuming that velocity of sound is 320 m/s.

If body having initial velocity zero is moving with uniform acceleration 8m//sec^(2) the distance travelled by it in fifth second will be

A particle has an initial velocity of 9m//s due east and a constant acceleration of 2m//s^(2) due west. The displacement coverd by the particle in the fifth second of its motion is :

A body has an initial velocity of 3m//s and has an acceleration of 1m//sec^(2) normal to the direction of the initial velocity. Then its velocity 4 seconds after the start is

A particle is moving with initial velocity 1m/s and acceleration a=(4t+3)m/s^(2) . Find velocity of particle at t=2sec .

A particle starting with certain initial velocity and uniform acceleration covers a distance of 12 m in first 3 seconds and a distance of 30 m in next 3 seconds. The initial velocity of the particle is

A particle moves along the x-axis obeying the equation x=t(t-1)(t-2) , where x is in meter and t is in second a. Find the initial velocity of the particle. b. Find the initial acceleration of the particle. c. Find the time when the displacement of the particle is zero. d. Find the displacement when the velocity of the particle is zero. e. Find the acceleration of the particle when its velocity is zero.