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AnnZ [28]
3 years ago
5

A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a poi

nt directly north of its departure point on the south bank. What is the speed of the boat relative to the water
Physics
1 answer:
Dmitry [639]3 years ago
7 0

Answer:

The right approach is "8.1 m/s". A further explanation is provided below.

Explanation:

According to the table,

Speed of Boat

= \frac{s}{t}

V_b=\frac{140}{20}

V_a = 4 \ m/s

V_B = 7 \ m/s

Now,

⇒  (V_{relative})^2 = (7)^2+(4)^2

or,

⇒  (V_r)^2=49+16

              =65

         V_r=\sqrt{65}

              =8.1 \ m/s

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Answer:

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Explanation:

The given kinematic equation is the 2nd equation of motion. The equation is as follows:

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where,

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a = 3100 m/1800 s²

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