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प्रश्न
When is the acceleration due to gravity negative?
उत्तर
If the body rises vertically upwards, then the value of acceleration due to gravity is negative.
संबंधित प्रश्न
A space craft flying in a straight course with velocity of 75 km s-1 fires its rocket motors for 6.0 s. At the end of this time its speed is 120 km s-1 in the same direction.
Find
(i) The space craft's average acceleration while the motors were firing
(ii) The distance travelled by the space craft in the first 10 s after the rocket motors were started, the motors being in action for only 6 s.
Write the SI unit of retardation.
Distinguish between uniformly and non-uniformly accelerated motions.
Convert the following acceleration:
7200 km/h2 into m/s2
Figure represents graphically the velocity of a car moving along a straight road over a period of 100 hours.
Calculate the acceleration along AB and the retardation along BC.
Negative acceleration is called ______.
State whether true or false. If false, correct the statement.
Acceleration can get negative value also.
A bus accelerating with 4ms-2 changes its speed from 60ms_1 to a certain value in 5s. The final speed is ______.
A car is being driven at a speed of 20ms-1 when brakes are applied to bring it to rest in 5 s. The deceleration produced in this case will be ______.
An object can be moving with uniform speed but with variable acceleration.
