Question

1.A store clerk pushes a row of shopping carts through the parking lot, accelerating them at 1 m/s2. If the carts have a mass of 300 kilograms, how much force did the clerk put on the carts?

2.A 75 kg person in a frictionless environment throws 5 kg ball with a force of 15N what is the acceleration of the ball?

with explanation:
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Answer 1

Answer:

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Answer 2

Given:

(1) A store clerk pushes a row of shopping carts through the parking lot, accelerating them at 1 ms⁻² and the carts have a mass of 300 kilograms.

(2) A 75 kg person in a frictionless environment throws 5 kg ball with a force of 15 N.

To find:

(1) Force applied by the clerk on the carts.

(2) Acceleration of the ball.

Solution:

• Force applied on an object is the cause that changes or tends to change its state of rest or motion. It is given by the formula,

        $F = m * a$

• Here, F is the force applied, m is the mass of the object and a is the acceleration produced.

(1)

• The force applied by the clerk is calculated as,

        $F = 300 kg * 1ms^{-2}$

            $= 300 N$

(2)

• The acceleration produced by the person on the ball can be calculated as,

         $15 N = 5 kg * a$

         $a = 3 ms^{2}$

Therefore,

(1) force applied by the clerk on the carts is 300 N.

(2) acceleration of the ball is 3 ms⁻².