You started to run at 10 km/h when you left your house and you arrived at school 30 minutes later. assuming that your average acceleration was 30 km/h/h, how fast were you running when you arrived? a) 15 km/hb) 20 km/hc) 25 km/hd) 30 km/h

correct option is C i.e. 25 km/hr

Explanation:

given data:

Initial velocity u = 10 km /h

acceleration a = 30 km/h^2

time = 30 min = 1/2 hr

we know from equation of motion, final velcoity is given as

final velocity = initial velocity + at

v = u + at

putting all value from above to get the final velocity value

 v  = 10 + 30* (1/2)

 v = 25 km/hr

so correct option is C i.e. 25 km/hr

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

scorpions are,

c.arachnids

  scorpions are animals in the order scorpiones, under the class arachnida, which makes them a distant cousin of spiders

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