<u>Answer:</u>
According to newton's first law of motion, friction is required to make an object slow down.
<u>Explanation:</u>
According to the Newton's first law of motion, for an object to change its velocity (either a change in the magnitude or the direction), there must be a cause to it which is defined as a net external force.
For example, an object which is sliding across a table or floor slows down due to the net force of friction that is acting on that object.
Momentum = velocity * mass. Momentum is always conserved. The ball's momentum before the impact is 0.05Vo. After the impact, it is 105Vf. (Vf = final velocity). Because momentum is conserved, we know that:
0.05Vo = 1.05Vf...
Vo = 21Vf...
Vf = Vo / 21.
Answer:
Explanation:
length L = 5±.1
percentage error
= 0.1/5 x 100 = 2%
breadth b = 3.8 ±.1
percentage error
= .1 / 3.8 x 100
= 2.6 %
Maximum reading of length = 5.1 m
maximum reading of breadth = 3.9m
maximum area possible = 5.1 x 3.9
= 19.9 m².
maximum possible error in the measurement of area in percentage terms
= 2+2.6 = 4.6 %
error in maximum area
19.9 x 4.6 /100
= .9 m²
Minimum possible measurement of area
4.9 x 3.7 = 18.1 m²
possible error
18.1 x 4.6 / 100
= .8 m²