Answer:![\dfrac{1}{60} ms^{-1}](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B60%7D%20ms%5E%7B-1%7D)
Explanation:
Speed of an object is defined as the ratio of the distance covered by the object to the time taken to cover that distance.
Let
be the speed of the object.
Let
be the distance travelled by the object.
Let
be the time taken by the object.
So,![s=\frac{D}{t}](https://tex.z-dn.net/?f=s%3D%5Cfrac%7BD%7D%7Bt%7D)
s=![\frac{2}{120}=\frac{1}{60}ms^{-1}](https://tex.z-dn.net/?f=%5Cfrac%7B2%7D%7B120%7D%3D%5Cfrac%7B1%7D%7B60%7Dms%5E%7B-1%7D)
So,the speed of the car is ![\frac{1}{60}ms^{-1}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B60%7Dms%5E%7B-1%7D)
Answer:
240cm
Explanation:
Speed = 6cm/s
Time = 40 seconds
Speed= distance/time
6cm/s = distance/40seconds
Distance = 6×40
Distance = 240cm
Hence, in 40 seconds, the ball must have rolled the distance of 240cm
Answer:
0.687 m/s
Explanation:
Initial energy = final energy
1/2 mu² = mgh + 1/2 mv²
1/2 u² = gh + 1/2 v²
Given u = 2.00 m/s, g = 9.8 m/s², and h = 0.180 m:
1/2 (2.00 m/s)² = (9.8 m/s²) (0.180 m) + 1/2 v²
v = 0.687 m/s
(B) 2.25cm
<u>Explanation:</u>
Given:
At 40 hours, the height of the bamboo plant is 2.1cm
At 50 hours, the height of the bamboo plant is 2.4cm
Height of the bamboo plant after 45 hours = ?
The difference in length from 40 to 50 hours = 2.4 - 2.1cm
= 0.3 cm
Mean of 40 and 50 is 45.
Thus,
At 45 hours, the height will increase by 0.3/2
= 0.15 cm
Height at 45 hour = 2.1 + 0.15cm
= 2.25cm
Therefore, the height of the plant after 45 hours is 2.25cm