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
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
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
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
A train of 150 m length is going towards north direction at a speed of 10m/s. A parrot flies at the speed of 5 m/s towards south direction parallel to the railways track.The time taken by the parrot to cross the train is
12 s
8 s
15 s
Zero
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
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
33.3 km/h
20 √2 km/h
25 √2 km/h
0.35 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
m1: m2 : m3
m1 : 2m2 : 3m3
1 : 1 : 1
