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Brut [27]
3 years ago
8

A boy is exerting a force of 70 N at a 50-degree angle on a lawn mower. He is accelerating at 1.8 m/s2. Round the answers to the

nearest whole number.
What is the mass of the lawn mower?

⇒ 25 kg

What is the normal force exerted on the lawn mower?

⇒ 299 N
Physics
1 answer:
LenaWriter [7]3 years ago
4 0

Explanation:

Given that,

Force, F = 70 N

Angle, \theta=50^{\circ}

Acceleration of the boy, a = 1.8 m/s²

(a) Net force is equal to the product of mass and acceleration. So,

m=\dfrac{F}{a}\\\\m=\dfrac{70}{1.8}\\\\m=38.89\ kg

(2) Normal force = upward force

So,

F=mg\cos\theta\\\\F=38.89\times 9.81\times \cos(50)\\F=245.23\ N

Hence, mass is 38.89 kg and the normal force is 245.23 N.

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