Atennis ball with a speed of 27.7 m/s is
moving perpendicular to a wall. after striking
the wall, the ball rebounds in the opposite
direction with a speed of 19.7224 m/s.
if the ball is in contact with the wall for
0.0146 s, what is the average acceleration of
the ball while it is in contact with the wall?
take “toward the wall” to be the positive
direction.
answer in units of m/s
2
.

it may be wrong but i think its a

it becomes positively charged by charging it

the total distance traveled by the car is

30km + 49km = 79 km .

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards