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jolli1 [7]
3 years ago
12

The distance xm travelled by a particle in time t seconds is described by the equation x = 10 + 12tsquare, Find the average spee

d of the particle between the time interval t = 2s and t = 5s
A. 60 ms-1
B. 72 ms-1
C. 84 ms-1
D. 108 ms-1​
Physics
1 answer:
Paraphin [41]3 years ago
5 0

After 2 seconds the particle will be in position

x(2)=10+12\cdot 2^2=10+12\cdot 4=10+48=58

After 5 seconds the particle will be in position

x(5)=10+12\cdot 5^2=10+12\cdot 25=10+300=310

So, the particle will travel

310-58=252

meters in 3 seconds, for an average speed of

\dfrac{252}{3}=84

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