Answer:
41
Explanation:
you subtract the initial velocity which is 10m/s from the final velocity which is 51m/s
746 joules per second = 746 watts = 1 horsepower
340 joules per second = 340 watts = (340/746) = <em>0.456 horsepower</em>
Power is a RATE or a SPEED of doing work.
How long you do it doesn't matter.
Just like 30 miles per hour doesn't change whether you do it for an hour or for 10 minutes.
a) Speed: It is the ratio of distance covered and time interval to cover that distance
it is given as 
b) Direction: it will define for vector quantities and shows the required direction for it
c) Velocity : It is rate of change in position or it is ratio of displacement and time
d) Vector : it is a type of physical quantity which will be defined by magnitude and direction both
e) Position : it is defined as the distance with respect to a given reference or origin
f) Acceleration : it is defined by rate of change in velocity.

g) Force = it is push or pull on an object which will create acceleration to the object
F = ma
it is product of mass and acceleration
h) Newton : it is SI unit of force or we measure force in this unit
Ballet dancers, before dancing on a smooth wooden floor they put a sticky powered called rosin on their shoes soles because the wooden floor has quite less friction and the dancer can slip and get hurt, so to avoid this, they apply those sticky powder to increase the friction between their shoe's sole and wooden floor.
And hence, they are taking advantage of frictional force.
Mass and velocity option A