Mass = 1kg
Distance = 1m
Time = 1s
Force= Mass x Acceleration due to graviy
= 1 x 9.8 = 9.8
Velocity = Distance / time
= 1 / 1 =1m/s
Power = Force x velocity
= 9.8 x 1 = 9.8 W
C) refract
Explanation:
When light passes from air into water, the light waves will bend or they refract and the pencil will appear to be broken.
In normal space, light travels along a straight path with no alteration of the path along which it travels.
- When light crosses the boundary from a denser to a less dense medium, it is refracted.
- Refraction implies that the angle of the light is bent.
- This is because the new medium causes the light rays to slow down compared to the speed it was coming forth with.
Learn more:
Refraction brainly.com/question/12370040
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<u>Answer:</u>
Takeoff speed of Kangaroo = 12.91 m/s
<u>Explanation:</u>
The distance reached by Kangaroo = 10 meter
Angle at which it jumps = 18°
The motion of Kangaroo is like a projectile, the distance traveled is the range of projectile.
Range of projectile = Time taken for the projectile to reach ground* Horizontal velocity
Time taken for the projectile to reach ground:
Time taken = Two times of the time taken for the projectile to reach maximum height
Time taken for the projectile to reach maximum height = Vertical speed / Acceleration = u sin θ/g
Time taken for the projectile to reach ground = 2 u sin θ/g
So Range of projectile = 
We have Range = 10 meter, θ = 18⁰
Substituting

Takeoff speed of Kangaroo = 12.91 m/s
Wind, running water, glaciers, waves, and gravity