Motion in One D...

The ratio between the distances travelled by a stone dropped from a certain height in its first two seconds and first three seconds is

The plot between displacements of a particle projected vertically upwards versus time is

A vehicle covers one half of the distance in 5 hours and other half in 7 hours. If the total distance is 360 km, the average speed of the vehicle is

A stone is projected with a speed of 15 m/s from a tower of height 50 m. The time taken by the stone to reach the ground is

An object starting from rest accelerates for 20 seconds at a rate of 2 m/s², maintains the speed for some time and decelerates at the rate of 1 m/s² to come to rest. If the total distance covered is 2000 m, the time duration during which the object travels with constant speed is

Three objects whose masses are in the ratio 1 : 2 : 3 are dropped from a certain height simultaneously. The ratio between their velocities with which they will hit the ground is

A cyclist cycles for t second at a speed of 3 m/s and then for the same time at a speed of 5 m/s along a straight road to North.What is the average speed of the cyclist?

Which of the following correctly describe(s) the displacement of a particle that moves along positive X-direction, and whose initial and final positions are d_i and d_f, respectively?

(A)  
(B)  
(C)
(D) 

A body starting from rest accelerates at 10 m/s². What is the distance travelled in the 3^rd second?

A car which is at rest starts accelerating at the rate of 2 m/s² when a motorcycle travelling with a constant speed of 54 kmph crosses it. The time at which the car will catch the motor cycle is

A body reduces its speed from 90 m/s to 72 m/s while covering a distance of 50 m. What was the value of retardation?

A point moves along X- axis with a speed of 50 m/s for 20 seconds, and suddenly changes its direction towards negative X-axis to travel with the same speed for another 30 seconds. The distance between its positions at t = 0 and t = 50 is

A car covers first 120 km in 4 hours, next 240 km in 6 hours and last 160 km in 3 hours. The average speed of the car is

An object moving with a speed of 50 m/s takes 8 seconds to come to rest. The distance travelled during this time duration is

Two cars starting from rest meet each other in 40 minutes when they approach each other from a distance of 120 km along a straight highway. If the speeds of the car are in the ratio of 2 : 3, their speeds are

A bullet fired with a speed of 300 m/s comes to rest after piercing a wall of thickness 10 cm. The retardation experienced by the bullet is

A stone is thrown upwards vertically at 60 m/s where g = 10 m/s².What will the value of the highest point reached bt the stone?

From the top of a tower 45 m high,two stones are released.One vertically downwards and the other with a horizontal velocity of 30 m/s^-1.How long will each stone take to strike the ground?

A car travels with a speed of 50 kmph for first two hours, 80 kmph for next two hours and 40 kmph for the last one hour. The average speed of the car is

A person covers a distance of 300 km in eight hours. During the first two hours of his journey, he could maintain a speed of 50 kmph, and had to wait at a place for two hours due to traffic jam. The speed with which he must have travelled during the last four hours of his journey is

An object moves in a straight line with the constant speed of 40 m/s for first 10 seconds and with 30 m/s for the next 10 seconds. The average speed of the particle is

Under what conditions,is the magnitude of average velocity of an object is equal to its average speed?

An object completes a semi circular path of radius 7 m. The ratio between its displacement and distance travelled is

Two balls, one dropped from the top of a tower of height 50 m and another projected from the bottom of the tower meet exactly midway. The minimum velocity of projection of the second ball is