You could be lying completley still on your bed, and all though it seems you are at rest, you are moving along with the earth around the sun and hence are motion. This is why 'being at rest' is more of a relative term. Hope this helps!
The acceleration of the car is stated as -2 m/s², while the deceleration of the car is termed as 2 m/s².
Answer:
Explanation:
Acceleration exerted by any object in order of decrease in the speed is termed as deceleration. In other words , negative acceleration or acceleration acting in opposite direction to stop the motion of any object is termed as deceleration. The magnitude of acceleration and deceleration is same only the direction is completely opposite to each other. So the negative sign will be obtained for acceleration value of any object whose velocity slows down from initial velocity.
Here , the initial velocity was 60 m/s and the final velocity is slowed down to 40 m/s in time 10 s.
So acceleration = (Final velocity - Initial velocty)/Time
Acceleration = (40-60)/10 = -20/10 = -2 m/s².
Thus, the acceleration of the car is stated as -2 m/s², while the deceleration of the car is termed as 2 m/s².
How do catalysts speed up reactions ?
by reducing the amount of energy required for the reaction to occur. other factors such as <span>catalysts' ability to speed a process are temperature, concentration </span>
Answer: 258.7 J
Explanation:
Velocity of object V=5m/s
Mass ; 5kg
Height; h=4m
Mechanical energy is equal to sum of kinetic and potential energy
E=K+Ep
Kinetic energy is calculeted using; K=m*V²/2
Potential energy is calculated using : Ep=m*G*h
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V=5m/s
m=5kg
h=4m
E=K+Ep
E=m*V²/2+m*G*h
E=5kg*(5m/s)²/2+5kg*9.81m/s²*4m
E=62.5J+196.2J
E=258.7 J
