Question

A ball which was at rest started rolling downhill and reached the base at a speed of 10m/s after 5 seconds .what is the acceleration of the ball?​

Answer 1

Given data : A ball which was at rest started rolling downhill and reached the base at a speed of 10 m/s after 5 seconds.

To find : What is the acceleration of the ball ?

Solution : according to given,

⟹ initial velocity of ball = 0

⟹ final velocity of ball = 10 m/s

⟹ time taken by ba to reach at a speed of 10m/s = 5 sec

Now, we use kinematical equation to find acceleration of the ball.

⟹ v = u + at

where,

• v = final velocity
• u = initial velocity
• a = acceleration of the particle
• t = time taken by partical

Now, by formula

⟹ v = u + at

⟹ 10 = 0 + a * 5

⟹ 10 - 0 = a * 5

⟹ 10 = a * 5

⟹ a = 10/5

⟹ a = 2 m/s²

Answer : Hence, acceleration of the ball is 2 m/s².

More info :

KINEMATICAL EQUATION'S

• v = u + a * t
• s = [(u + v)/2] * t
• s = u * t + ½ * a * t²
• s = v * t - ½ * a * t²

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