Your brother is driving 40 km/hour when he slams on his brakes to avoid hitting a dog crossing the road. if it takes him 5 seconds to stop, what is his
rate of acceleration?

A. 8 km/hr/sec

B. 40 km/hr/sec

C. 45 km/hr/sec

D.200 km/hr/sec

8

Step-by-step explanation:

40 divided by 5 is 8 :D

A. 8 km/hr/sec

Step-by-step explanation:

You divide 40 by 5

40/5

which you'll get

8

intensity of the vector is v= √37 ≈ 6.08 units and make angle ∡α ≈ 9.46° with east direction

step-by-step explanation:

required vector is consists of the two componentsvx= 2+4=6 units   and vy= 1 unit and vx ⊥ vywe will use pythagorian theorem to find intensity of the vector vv∧2 = vx∧2 + vy∧2 => v = √vx∧2 + vy∧2 = √6∧2 + 1∧2 = √36+1 = √37 ≈ 6.08 unitsthe angle ∡α between vector and east direction we wil find with tanαtanα = 1/6 => α = arc tanα = arc 1/6 => α ≈ 9.46°

hope this