A ball which is at rest is dropped from a height h metre. As it bounces off the floor its speed is 80% of what is just before touching the ground. The ball will then rise to nearly a height
0.94 h
0.80 h
0.75 h
0.64 h
Which among the following is the expression for maximum height travelled by an object?
ut + ½at2
u/g
u2/2g
2as
The free fall of a body is influenced only by
Mass of the body
Pressure of air
Gravity
Height of the object
Time for which a body remains in the air is called
Time of ascent
Time of descent
Time period
Time of flight
An aeroplane accelerates down a runway at 4m/s2 for 30s until is finally lifts off the ground. Determine the distance travelled before take off.
1700m
1600m
1800m
1400m
The value of ‘g’ is taken as negative for
Objects moving downwards
Object moving upwards
Object at the centre of earth
Object at the surface of earth.
The time taken by a body, thrown up to reach the maximum height is known as
Time of fall
Time of lifting
For a freely falling body with an initial velocity, u = 0, the velocity gradually become
decreased
increased
doubled
halved
The time of ascent is directly proportional to
initial velocity
final velocity
acceleration due to gravity
time of flight
Time taken by a freely falling body to touch the ground is called
