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
40 km/h
48 km/h
50 km/h
60 km/h
A ball P is dropped vertically and another ball Q is thrown horizontally from the same height and at the same time. If air resistance is neglected, then,
Ball P reaches the ground first
Ball Q reaches the ground first
Both the balls reach the ground at the same time
Respective masses of the two balls will decide the time
If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine is ( Take g = 9.8 m/s2)
9.8 m/s
19.6 m/s
39.2 m/s
98 m/s
A stone released with zero velocity from the top of a tower, reaches the ground in 4 s. The height of the tower is ( g = 10m/s2)
20 m
40 m
80 m
160 m
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
5 s
36 s
38 s
10 s
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?
zero
2 R
2 π R
7 π R
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
A body is thrown vertically upwards from the ground. It reaches a maximum height of 20 m in 5s. After what time it will reach the ground from its maximum height position?
2.5 s
25 s
m1: m2 : m3
m1 : 2m2 : 3m3
1 : 1 : 1
If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s, it covers a distance of
2880 m
1440 m
400 m
