The SI unit for the resultant velocity is
m/s
km/s
cm/s
mm/s
In the equation of motion, x = at + bt2 , the units of a and b respectively are
m/s2 , m/s
m/s, m/s2
m/s, m/s
none of these
In the equation of motion, S = ut +1/2 at2 , S stands for
distance in t seconds
distance in the tth second
maximum height reached
The physical quantity corresponding to the rate of change of displacement is
speed
velocity
acceleration
retardation
A body changes its velocity from 5 ms-1 to 35ms-1 in a time 10 S.The acceleration of the body is
5ms-2
3ms-2
30ms-2
25ms-2
The velocity of a body at rest is always
unity
negative
zero
infinite
A body goes from A to B with a velocity of 20 m/s and comes back from B to A with a velocity of 30 m/s. The average velocity of the body during the whole journey is
24 m/s
25m/s
A train passes over a 400 m long bridge. If the speed of the train is 30 m/s and the train takes 20 s to cross the bridge, find the length of the train.
400 m
600 m
800 m
200 m
When the distance an object travels is directly proportional to the length of time, it is said to travel with
zero velocity
constant acceleration
constant speed
uniform velocity
The unit for the rate of change of velocity will be
m/s2
Ns
N/s
