Advertisements
Advertisements
प्रश्न
A bus increases its speed from 36 km/h to 72 km/h in 10 seconds. Its acceleration is :
विकल्प
5 m/s2
2 m/s2
3.6 m/s2
1 m/s2
Advertisements
उत्तर
1 m/s2
Final velocity is = 72 km/h = 20 m/s
Initial velocity is = 36 km/h = 10 m/s
Time taken is 10 sec. so,
Acceleration = `(20-10)/10`
= 1 m/s2
So, the answer is
(d) 1 m/s2
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.
Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
Name the physical quantity whose SI unit is :
(a) m/s (b) m/s2
Find the initial velocity of a car which is stopped in 10 seconds by applying brakes. The retardation due to brakes is 2.5 m/s2.
A bus was moving with a speed of 54 km/h. On applying brakes it stopped in 8 seconds. Calculate the acceleration.
A car is travelling along the road at 8 ms-1. It accelerates at 1 ms-2 for a distance of 18 m. How fast is it then travelling ?
A body, initially at rest, starts moving with a constant acceleration 2 m s-2. Calculate: (i) the velocity acquired and (ii) the distance travelled in 5 s.
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)
How will the equations of motion for an object moving with a uniform velocity change?
When will you say a body is at uniform acceleration?
