Answer:
(C) Only if it starts moving
Explanation:
We know that work done is given by
So there are two case in which work done is zero
First case is that when force and displacement are perpendicular to each other
And other case is that when there is no displacement
So for work to be done there must have displacement, if there is no displacement then there is no work done
So option (c) will be the correct option
Answer:
24.084 m/s
Explanation:
From the law of conservation of linear momentum
Total momentum before collision equals to the total momentum after collision
Since momentum=mv where m is mass and v is velocity
where 
is the mass of the truck, 
is velocity of the truck, 
is the common velocity of moving and standing truck after collision and 
is the mass of the standing truck
Making the subject we obtain
Substituting as 25000 Kg, as 22.3 m/s, as 2000 Kg we obtain
Therefore, assuming no friction and considering that after collision they still move eastwards hence common velocity and initial truck velocities are positive
The truck was moving at 24.084 m/s
Answer:
Sorry, I don't understand this language, sorry dear
Answer:
Middle childhood
Explanation:
<em>Middle childhood happens around ages 6 to 12,</em> is a stage in the human development characterized by the steady rate of physical growth of the individual in contrast with the fast rate of emotional, cognitive and emotional development that will prepare them for future stages (adolescence and adulthood).
I hope you find this information useful and interesting! Good luck!
Some animals that live in the tundra are caribou, polar bears, and voles. This is a cold environment so they feel comfortable. Their fur keeps them warm so they have no problem with adapting to their surroundings.
