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 car travels for half of its time at 80 km/h and for the rest half time at 40 km/h. Total distance covered is 60 km. What is the average speed of the car?
80 km/h
120 km/h
180 km/h
A body dropped from top of a tower fall through 40 m during the last two seconds of its fall. The height of tower is (g = 10m/s2)
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
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?
The maximum range of a gun of horizontal terrain is 16 km. If g = 10 ms-2 , then muzzle velocity of a shell must be
160 ms-1
200√2 ms-1
400 ms-1
800 ms-1
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
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
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)
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