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The displacement of a particle in time t is given by s = 2t² – 3t + 1. The acceleration is

The equation of motion of a car is s = t² – 2t , where t is measured in hours and s in kilometers. when the distance travelled by the car is 15 km, the velocity of the car is

A particle is moving in a straight line according as s = 45t+11t² – t³, then the time when it will come to rest, is

A particle is moving in a straight line according to the formula s = t² + 8t + 12. If s be measured in meters and t be measured in seconds then the average velocity of the particle in third second is

If 2t = v², then dv/dt is equal to

The equation of motion of a particle moving along a straight line is s = 2t³ – 9t² + 12t, where the units of s and t are cm and sec. The acceleration of the particle will be zero after

A body moves according to the formula v = 1+t², where v is the velocity at time t. The acceleration after 3 sec will be (v in cm/sec)