A body falling from rest describes distances S1, S2 and S3 in the first, second and third seconds of its fall. The ratio of S1 : S2 : S3 is
1 : 2 : 3
1 : 3 : 5
1 : 1 : 1
1 : 4 : 9
A car moves a distance of 200 m. It covers the first-half of the distance at speed v. The average speed is 48 km/h. Find the value of v.
m1: m2 : m3
m1 : 2m2 : 3m3
A car is moving along a straight road with a uniform acceleration. It passes through two points P and Q separated by a distance with velocity 30 km/h and 40 km/h respectively. The velocity of the car midway between P and Q is
20 √2 km/h
25 √2 km/h
One train A 120 m long is moving in a direction with a speed of 20 m/s. Another train B 130 m long is moving with a speed of 30 m/s in the opposite direction. The train B crosses the train A in a time
A car covers the first – half of the distance between two places at 40 km/h and other half at 60km/h. The average speed of the car is
The ratios of the distance covered by a freely falling particle, starting from rest in the first, second, third ... nth seconds of its motion
Form the series corresponding to the squares of the first n natural numbers
Form an A.P.
Form a series corresponding to the difference of the squares of the successive natural numbers
Both choices (b) and (c) are correct
What will be ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?
4 : 5
7 : 9
16 : 25
1 : 1
An athlete completes one round of a circular track of radius r in 40 seconds. What will be his displacement at the end of 2 min and 20 seconds?
2 π R
7 π R