Bob rides his bike with a constant speed of 10 miles per hour. How long will he take to travel a distance of 15 miles?
1 answer:
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Give u = start velocity
v = end velocity
v = u + at
50 = 400 + a*30
30a = -350
a = -116.67 m/
**Why the accecleration is negative number**
Because displacement, velocity, and acceleration are VECTOR QUANTITIES.
Vector Quantity must have direction.