Question

a: A car is accelerating uniformly from a rest state at 4 m/s^2. What distance does the car travel for 3 secs?

b: Two equal and opposite forces of 3.0 N act on an object. What is the unbalanced force on the object?

c: A 2kg ball with a velocity of 3 m/s strikes a 1kg stationary ball and the two balls stick together and move after the collision. With what velocity will the balls move after the collision?

d: What is the gravitational potential energy of a ball with a weight of 50 N when it is sitting on a shelf 2 m above the floor ?

e: If a 60kg sprinter can accelerate from a standing start to a speed of 10 m/s in 2s. what average power is generated?

Thanks for your help and please write clearly.

Answer 1

here,

a)

the initial speed , u = 0 m/s

acceleration , a = 4 m/s^2

time interval , t = 3 s

the distance travelled in 3 s , s = u * t + 0.5 * a * t^2

s = 0 + 0.5 * 4 * 3^2 m

s = 18 m