Motion in a Straight Line · Question 31

A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 m s-1 to 20 m s-1 while passing through a distance 135 m in t second. The value of t is

1. 12
2. 9
3. 10
4. 1.8

The distance travelled by a particle starting from rest and moving with an acceleration 43 m s-2, in the third second is

1. 103 m
2. 193 m
3. 6 m
4. 4 m

A particle shows distance - time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point [figure]

1. D
2. A
3. B
4. C

A particle moving along x-axis has acceleration f, at time t, given by f = f0 (1 - tT ), where f0 and T are constants. The particle at t = 0 has zero velocity. In the time interval between t = 0 and the instant when f = 0, the particle's velocity (vx) is

1. 12f0T2
2. f0T2
3. 12f0T
4. f0T

A car moves from X to Y with a uniform speed vu and returns to X with a uniform speed vd. The average speed for this round trip is

1. vu vd
2. vd vuvd + vu
3. vu + vd2
4. 2vd vuvd + vu

The position x of a particle with respect to time t along x-axis is given by x = 9t2 - t3 where x is in metres and t in seconds. What will be the position of this particle when it achieves maximum speed along the +x direction?

1. 54 m
2. 81 m
3. 24 m
4. 32 m

Two bodies A (of mass 1 kg) and B (of mass 3 kg) are dropped from heights of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is

1. 4/5
2. 5/4
3. 12/5
4. 5/12

A particle moves along a straight line OX. At a time t (in seconds) the distance x (in metres) of the particle from O is given by x = 40 + 12t - t3. How long would the particle travel before coming to rest ?

1. 16 m
2. 24 m
3. 40 m
4. 56 m

A ball is thrown vertically upward. It has a speed of 10 m/s when it has reached one half of its maximum height. How high does the ball rise? (Take g = 10 m/s2.)

1. 10 m
2. 5 m
3. 15 m
4. 20 m

The displacement x of a particle varies with time t as x = ae- t + be t, where a, b, and are positive constants. The velocity of the particle will

1. be independent of
2. drop to zero when =
3. go on decreasing with time
4. go on increasing with time.