Motion In A Straight Line

Energy required to accelerate a car from to compared with that required to accelerate it frem to is

Which of the following statements are incorrect ? (i) Average velocity is path length divided by time interval. (ii) In general, speed is greater than the magnitude of the velocity. (iii) A particle moving in a given direction with a non-zero velocity can have zero speed. (iv) The magnitude of average velocity is the average speed.

Which of the following graphs cannot possibly represent one dimensional motion of a particle?

A body is thrown up vertically from the ground with a velocity and another body is simultaneously dropped from a height . They meet at a height if is equal to

A body travelling along a straight line traverse one-third the distance with a velocity of . The remaining part of the distance was covered with velocity for half the time and with velocity for the other half of the time. The average velocity of the body over the whole time of motion will be

The rotor�s velocity of a helicopter engine changes from to in 2 minutes. How long does the rotor blades take to stop?

A particle is thrown vertically up with an initial velocity 9 m/s from the surface of Earth ( ).The time taken by the particle to reach a height of from the surface second time (in seconds) is

Two trains and each of length are moving on two parallel tracks with a uniform speed in the same direction with ahead of . The driver of decides to overtake and accelerates by . If after , the guard of just brushes past , what was the original distance between them ?

At a certain time a particle has a speed of in positive x-direction and later its speed was in the opposite direction. What is the magnitude of the average acceleration of the particle during the interval?

The displacement of a body varies with time as , where is in metres and is in seconds. The time taken by the body to come to rest is

A drunkard walking in a narrow lane takes steps forward and steps backward followed again by steps forward and steps backward and so on. Each step is lm long and requires Is. Determine how long the drunkard takes to fall in a pit away from the starting point?