In Fig.1.35, the velocity of the body at A is
zero
unity
maximum
infinite
S.I unit of retardation is
ms^{2}
ms
ms^{-1}
ms^{-2 }
The acceleration of a body projected upwards with a certain velocity is
9.8 m/s^{2}
-9.8 m/s^{2}
insufficient data
Area under a velocity-time graph gives
the time taken by a moving object
the displacement of a moving object.
the acceleration of moving object
the retardation of a moving object
A train 50 m long passes over a bridge at a velocity of 30 km/h. If it takes 36 s to cross the bridge, the length the length of the bridge will be
100 m
200 m
250 m
300 m
Choose the wrong statement :
Retardation is a vector quantity
Acceleration due to gravity is a vector quantity
Average speed is a vector quantity
Displacement is a vector quantity
Which of the following is a vector quantity?
Mass
Time
Displacement
Speed
When a graph between two physical quantities is a straight line, the two quantities are :
both constant
independent
directly proportional
inversely proportional
A body is thrown vertically upwards and rises to a height of 10 m. The velocity with which the body was thrown upwards is ( g = 9.8 m/s^{2} )
10 m/s
20 m/s
14 m/s
none of these
A stone tied to a string is whirled in a circle. As it is revolving, the rope suddenly breaks. Then
the stone files off tangentially
the stone moves radially inward
the stone moves radially outward
the motion of the stone depends upon its velocity