Advertisements
Advertisements
प्रश्न
A bus decreases its speed from 80 km h−1 to 60 km h−1 in 5 s. Find the acceleration of the bus.
Advertisements
उत्तर
Initial velocity = 80km/h
= 80 × 100060 × 60
= 22.22 m/s
Time = 5s
Final velocity v = 60 km/h
= 60 × 100060 × 60
= 16.66 m/s
Acceleration = `"Change in velocity"/"Time taken"`
= `"(Final velocity - Initial velocity)"/"Time taken"`
= `(16.66-22.22 )/5`
= -1.11ms-2
Hence, acceleration of the bus = -1.11ms-2
APPEARS IN
संबंधित प्रश्न
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.
Explain why, the motion of a body which is moving with constant speed in a circular path is said to be accelerated.
Describe the motion of a body which is accelerating at a constant rate of 10 m s–2. If the body starts from rest, how much distance will it cover in 2 s ?
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 formula : v = u + at, where the symbols have usual meanings.
Multiple choice Question. Select the correct option.
At the maximum height, a body thrown vertically upwards has :
Can you suggest a real-life example about the motion of a body from the following velocity – time graph?
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)
How will the equations of motion for an object moving with a uniform velocity change?
Draw a velocity versus time graph of a stone thrown vertically upwards and then coming downwards after attaining the maximum height.
