Advertisements
Advertisements
Question
Define velocity. State its unit.
Advertisements
Solution
The velocity of a body is the distance travelled per second by the body in a specified direction.
Its SI unit is metre/second (m/s).
APPEARS IN
RELATED QUESTIONS
A train starting from a railway station and moving with uniform acceleration attains a speed 40 km h−1 in 10 minutes. Find its acceleration.
What term is used to denote the change of velocity with time ?
What conclusion can you draw about the velocity of a body from the displacement-time graph shown below :
A bus running at a speed of 18 km/h is stopped in 2.5 seconds by applying brakes. Calculate the retardation produced.
Explain the meaning of the following equation of motion :v = u + at, where symbols have their usual meanings.
A body starting from rest travels with uniform acceleration. If it travels 100 m in 5 s, what is the value of acceleration ?
Derive the following equations for uniformly accelerated motion:
(i) v = u + at
(ii) `"S = ut" + 1/2 "at"^2`
(iii) v2 = u2 + 2aS
where the symbols have their usual meanings.
A packet is dropped from a stationary helicopter, hovering at a height ‘h’ from ground level, reaches the ground in 12s. Calculate
- the value of h
- final velocity of packet on reaching the ground. (Take g = 9.8 ms−2)
A stone thrown vertically upwards takes 3 s to attain maximum height. Calculate
- initial velocity of the stone
- maximum height attained by the stone. (Take g = 9.8 ms−2)
Draw a velocity versus time graph of a stone thrown vertically upwards and then coming downwards after attaining the maximum height.
