Question

1. a 5kg object accelerates at 7 m/s² for 4 m. how much work is done?

Explanation:

Step1: Find the force using F = ma

The formula for force is \( F = m \times a \), where \( m = 5 \, \text{kg} \) and \( a = 7 \, \text{m/s}^2 \). So, \( F = 5 \times 7 = 35 \, \text{N} \).

Step2: Calculate work using W = Fd

The formula for work is \( W = F \times d \), where \( F = 35 \, \text{N} \) and \( d = 4 \, \text{m} \). So, \( W = 35 \times 4 = 140 \, \text{J} \).

Answer:

140 Joules