Advertisements
Advertisements
Question
A ball is thrown up with a speed of 4.9 ms-1.
Calculate the time it takes to reach this height.
Advertisements
Solution
Initial speed of ball is = 4.9 ms-1.
Acceleration due to gravity = -9.8 ms-2.
We know v = u + at
0 = 4.9 - 9.8 t
T = 0.5 sec.
APPEARS IN
RELATED QUESTIONS
How does the force of gravitation between two objects change when the distance between them is reduced to half?
Choose the correct answer from among the given ones:
For the problem 8.10, the direction of the gravitational intensity at an arbitrary point P is indicated by the arrow (i) d, (ii) e, (iii) f, (iv) g.
How will you ‘weigh the sun’, that is estimate its mass? The mean orbital radius of the earth around the sun is 1.5 × 108 km.
State Kepler’s law which is represented by the relation r3 ∝ T2.
State and explain Kepler's laws of planetary motion. Draw diagrams to illustrate these laws.
Can you think of two particles which do not exert gravitational force on each other?
Two spherical balls of mass 10 kg each are placed 10 cm apart. Find the gravitational force of attraction between them.
State whether the gravitational force between two masses is attractive or repulsive ?
The gravitational force between two bodies is directly proportional to the product of the masses of those bodies and is ______ of the distance between them.
If the mass of one object is doubled and distance remains the same, the gravitational force will ______.
