Question

A canoe is drifting left toward a hungry hippo with a velocity of 7\,\dfrac{\text{m}}{\text{s}}7

Answer 1

Answer: 17 m/s

Velocity and acceleration are vector quantities. Let leftwards be defines as negative and rightwards as positive direction.

It is given that canoe is drifting left with a velocity of $u=-7 m/s$

The canoe rider is moving towards right with a constant acceleration, $a=6 m/s^2$

we need to find the velocity of canoe after 4 s.

we will use the equation of motion:

$v=u+at$

where, v is the final velocity, u is the initial velocity, a is the acceleration and t is the time.

Insert the values in the above equation:

$\Rightarrow v=-7m/s+6 m/s^2 \times 4 s=24m/s-7 m/s=17 m/s$

Hence, velocity of canoe after 4 s would be 17 m/s.