Advertisements
Advertisements
प्रश्न
A ball hits a wall horizontally at 6.0 m s-1. It rebounds horizontally at 4.4 m s-1. The ball is in contact with the wall for 0.040 s. What is the acceleration of the ball ?
Advertisements
उत्तर
We have to find the value of uniform acceleration.
We have:
Initial velocity (u) = 6 m/s
Final velocity is in opposite direction to that of initial velocity (v) = –4.4 m/s
Time taken (t) = 0.04 s
Acceleration :
`a = "υ-u"/t`
Put the values in the above equation to get the value of acceleration .
`a = "-4.4-6"/0.04`
= `10.4/0.04`
= `-260 "m/s"^2`
APPEARS IN
संबंधित प्रश्न
Under which condition is the magnitude of average velocity equal to average speed ?
A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey.
A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds:
What is its average speed ?
A train starting from rest moves with a uniform acceleration of 0.2 m/s2 for 5 minutes. Calculate the speed acquired and the distance travelled in this time.
A car travels the first 30 km with a uniform speed of 60 km h−1 and the next 30 km with a uniform speed of 40 km h−1. Calculate :
- The total time of journey,
- The average speed of the car.
A car moving on a straight path covers a distance of 1 km due east in 100 s. What is the speed of the car?
Draw a diagram to show the motion of a body whose speed remains constant, but velocity changes continuously.
Define speed of a body.
A motorcyclist drives from A to B with a uniform speed of 30 km h–1 and returns back with a speed of 20 km h–1. Find its average speed.
