3 years ago

A cat is trying to cross the street. Its velocity v as a function of time t is given in the graph below where

Physics

2 answers:

bija089 [108]3 years ago

8 0

Answer:

3.8

Explanation:

Vesna [10]3 years ago

5 0

Answer:

rightwards is the positive velocity

Rightwards is the positive elicitation:

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John is going to use a rope to pull his sister Laura across the ground in a sled through the snow. He is pulling horizontally wi

bulgar [2K]

Answer:

The mass of Laura and the sled combined is 887.5 kg

Explanation:

The total force due to weight of Laura and friction on the sled can be calculated as follows;

$F_T = F_L+F_S$

= (400 + 310) N

= 710 N

From Newton's second law of motion, "the rate of change of momentum is directly proportional to the applied force.

$F_T = \frac{(M_L+M_S)V}{t}$

where;

$M_L$ is mass of Laura and

$M_S$ is mass of sled

Mass of Laura and the sled combined is calculated as follows;

$(M_L+M_S) = \frac{F_T*t}{V}$

given

V = Δv = 4-0 = 4m/s

t = 5 s

$(M_L+M_S) = \frac{710*5}{4}\\\\(M_L+M_S) = 887.5 kg$

Therefore, the mass of Laura and the sled combined is 887.5 kg

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nevsk [136]

4 m/s because it is THR fastest voice

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2 years ago

In a closed system that has 45 J of mechanical energy, the gravitational

Digiron [165]

Answer:

The answer is B- it decreases from 40 J to 37 J.

Explanation:

Because as you see it was at 8 then it went down 3 just like how it started at 40 and went down 3 to 37.

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u need to make sure that comparison is = to shapes and then find the shapes sizes and add them

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